This protein powder mug cake recipe is for you if you want a protein-packed snack or dessert in minutes. I’m sharing three of my favourite versions, so whether you’re craving a warm, chocolatey cake, gooey chocolate chips, or something a little fresher like strawberry and white chocolate, there’s a flavour for you. They’re soft, cake-like, single-serving and made entirely in the microwave, so you can satisfy a cake craving without making an entire cake.
Protein Powder Mug Cake Recipe
I developed these protein mug cakes in my own kitchen because I wanted a quick, single-serving dessert that actually tasted like cake. I’ve made plenty of protein-based baked treats where the protein powder can leave the texture a little dry or rubbery, so getting that soft, cake-like texture was really important to me when developing these.
The result is three easy mug cake recipes that you can make in just a few minutes. The Chocolate Chip Protein Mug Cake is soft and vanilla-flavoured with gooey chocolate chips, the Biscoff Chocolate Protein Mug Cake is rich and chocolatey with Biscoff, and the Strawberry White Chocolate Protein Mug Cake is a little lighter and fruitier.
They’re all single serving, high in protein and made in the microwave, so they’re great when you want a quick post workout snack or an easy dessert without making an entire cake.
Why You’ll Love These Protein Mug Cakes
- Quick and easy: Ready in just a few minutes with minimal washing up.
- Single serving: Perfect when you want cake without making a whole batch.
- High in protein: Each mug cake contains around 20 g of protein.
- Three flavours: Choose from Chocolate Chip, Biscoff Chocolate, or Strawberry White Chocolate.
- Easy to customise: Add your favourite toppings or mix-ins to make them your own.
Can You Add Protein Powder To a Mug Cake?
Yes, you can, but the amount of protein powder you use makes a big difference to the final texture.
Protein powder absorbs liquid differently from regular flour, which means adding too much can make a mug cake dry, dense or rubbery. Since a microwave cooks a mug cake so quickly, there’s also less room for error than with a traditional cake.
When I developed these recipes, I found that balancing the protein powder with oat flour and enough liquid was key to getting a soft, cake-like texture. You want enough protein powder to make the mug cake genuinely high in protein, without adding so much that it overwhelms the rest of the ingredients.
The type of protein powder matters too. These recipes use vanilla protein powder for the Chocolate Chip and Strawberry White Chocolate versions and chocolate protein powder for the Biscoff Chocolate version. Different brands can absorb liquid differently, so the consistency of your batter may vary slightly depending on the protein powder you use.
That’s why I wouldn’t recommend simply adding a scoop of protein powder to any regular mug cake recipe. The other ingredients need to be balanced around it too.
Ingredients You’ll Need
The ingredients for these mug cakes are simple, and most of the base ingredients are the same across all three flavors. The main differences come from the protein powder and flavor-specific mix-ins.
- Protein Powder: Protein powder provides most of the protein in these mug cakes while also contributing to the structure. I use vanilla protein powder for the Chocolate Chip and Strawberry White Chocolate versions, and chocolate protein powder for the Biscoff Chocolate version. Protein powders can vary quite a bit between brands, particularly in how much liquid they absorb, so I recommend using a protein powder you already know and enjoy. If your protein powder absorbs more liquid than mine, you may need a small splash of extra milk to get the right batter consistency.
- Oat Flour: Oat flour provides the rest of the structure while keeping the mug cake soft and tender. I prefer it here because it gives the cakes a more traditional cake-like texture without making them heavy. You can buy oat flour or make your own by blending rolled oats into a fine flour.
- Baking Powder: A little baking powder helps the mug cake rise as it cooks, giving it a lighter texture rather than leaving you with a dense block of cake. Because you’re working with such a small amount of batter, you only need a small amount. Too much isn’t necessary.
- Maple Syrup: I use maple syrup as the sweetener in these recipes. It adds sweetness while also contributing a little moisture to the batter, which is helpful when you’re working with protein powder.
- Unsweetened Almond Milk: Unsweetened almond milk brings the batter together and provides the liquid needed for the protein powder and oat flour to hydrate. It also helps keep the finished mug cake soft rather than dry. You can use dairy milk instead if that’s what you have on hand.
Flavor-Specific Ingredients
The base ingredients stay relatively simple, and then each flavor gets a few additions to give it a completely different taste.
Chocolate Chip: Vanilla protein powder, vanilla extract and chocolate chips give this version its classic chocolate chip cake flavor.
Biscoff Chocolate: Chocolate protein powder and cocoa powder create the chocolate base, while Biscoff spread and chocolate chips make it richer and more indulgent.
Strawberry White Chocolate: Vanilla protein powder is combined with fresh strawberries and white chocolate chips for a fruity, sweet version.
How To Make a Protein Powder Mug Cake
The basic method is the same for all three flavors, which is one of the reasons these are so easy to make. You’ll just need a microwave safe mug or ramekin and a few minutes.
Step One
Add the dry ingredients to your microwave safe mug or ramekin.
For all three versions, this includes the protein powder, oat flour and baking powder. If you’re making the Biscoff Chocolate version, add the cocoa powder at this stage too.
Give everything a good stir so the dry ingredients are evenly combined before adding the liquid.
Step Two
Add the wet ingredients and flavorings.
Add the maple syrup and unsweetened almond milk, along with the vanilla extract for the flavors that use it. Stir until you have a smooth, thick batter with no dry pockets.
Then add your flavor-specific ingredients. Stir the chocolate chips into the Chocolate Chip version, mix the Biscoff spread and chocolate chips into the Biscoff Chocolate version, and gently fold the strawberries and white chocolate chips into the Strawberry White Chocolate batter.
The batter should be thick but still easy to stir. If it looks particularly dry, add a small splash of almond milk.
Step Three
Microwave until just cooked.
Place your mug or ramekin in the microwave and cook according to the time listed in the recipe card. The Chocolate Chip and Biscoff Chocolate versions take around 45 to 60 seconds, while the Strawberry White Chocolate version may need slightly longer because of the fresh strawberries.
The exact cooking time will depend on your microwave, so don’t rely on the time alone. Start checking the mug cake at the lower end of the cooking time, especially if your microwave is powerful. The top should look set, while the center should still be soft. Be careful not to overcook it, as this is the easiest way to end up with a dry or rubbery protein mug cake.
Let it sit for about a minute before eating. It will continue to firm up slightly as it cools.
3 Protein Powder Mug Cake Flavors
If you’re not sure which one to make first, here’s a quick rundown of all three.
Chocolate Chip Protein Mug Cake
A soft vanilla cake base with chocolate chips throughout, so you get little pockets of melted chocolate in every bite. It’s a great starting point if you want something simple and familiar, and it’s probably the one I’d make when I’m craving a traditional chocolate chip cake but only want one serving.
Biscoff Chocolate Protein Mug Cake
If you’re a chocolate and Biscoff fan, this is the one for you. Chocolate protein powder and cocoa powder give the cake a rich chocolate base, while Biscoff spread adds that caramelised cookie flavour and makes the texture extra indulgent.
The chocolate chips are the finishing touch, giving you melted chocolate alongside the Biscoff in each bite.
Strawberry White Chocolate Protein Mug Cake
The Strawberry White Chocolate version is the freshest of the three. It combines a vanilla cake base with chopped strawberries and sweet white chocolate chips.
The strawberries add little pockets of fruity flavour and moisture, while the white chocolate makes the cake feel more like a dessert. It’s a nice option when you want something different from the usual chocolate mug cake.
Tips and Flavor Variations
- Don’t overcook it: This is the most important tip for getting a soft protein mug cake. Microwave cooking times can vary, so I recommend starting with the shorter cooking time and adding a few seconds if needed. The mug cake should look set on top but still be soft in the center. It will continue to cook slightly from the residual heat once you take it out of the microwave, so it’s better to slightly undercook it than leave it in for too long.
- Adjust the milk if needed: Different protein powders absorb different amounts of liquid, so your batter may not look exactly like mine. It should be thick and spoonable, but not dry or difficult to stir. If your batter looks particularly thick after mixing, add a small splash of unsweetened almond milk until it reaches the right consistency.
- Use the right mug: Make sure you use a microwave safe mug or ramekin with enough room for the batter to rise. You don’t want to fill a small mug right to the top, as the cake will puff up while it cooks. I also prefer a wider mug or ramekin rather than a very narrow, deep mug because it makes the cake easier to eat straight from the mug.
- Try different toppings: These mug cakes are delicious on their own, but you can make them more indulgent with a few simple toppings. Try adding a scoop of ice cream while the cake is still warm, a few extra chocolate chips, or a drizzle of maple syrup.
- Try different flavor combinations: The three flavors in this recipe are a good starting point, but you can use the same basic idea to create your own combinations. Think about pairing a vanilla protein powder with complementary mix-ins, or using chocolate protein powder and cocoa powder for a richer chocolate base.
Frequently Asked Questions
What is the best protein powder to use for a mug cake?
The best protein powder is one that you already enjoy the taste of and that works well for baking. I use vanilla protein powder for the Chocolate Chip and Strawberry White Chocolate versions and chocolate protein powder for the Biscoff Chocolate version.
Different protein powders can absorb liquid differently, so you may need to adjust the amount of almond milk slightly depending on the brand you use.
Why does my protein mug cake turn rubbery?
The most common reasons are using too much protein powder or overcooking the mug cake.
Protein powder becomes firmer as it cooks, and the microwave cooks the cake very quickly. Even an extra 10 to 15 seconds can make a noticeable difference to the texture.
For a soft mug cake, use the amount of protein powder specified in the recipe and start checking it at the lower end of the cooking time.
Can I use dairy milk instead of almond milk?
Yes. You can use dairy milk instead of unsweetened almond milk if you prefer. The recipe will still work, although dairy milk may give the cake a slightly richer flavor and texture.
Can I make a protein mug cake without a microwave?
Yes, although this recipe was specifically developed as a microwave mug cake.
If you don’t have a microwave, you can transfer the batter to an oven-safe ramekin and bake it in a preheated oven. The cooking time will be considerably longer than the microwave version and will depend on the size and material of your ramekin, so check it regularly and bake until the center is set but still soft.
Can I use coconut flour instead of oat flour?
I wouldn’t recommend substituting coconut flour directly in this recipe. Coconut flour absorbs significantly more liquid than oat flour, so using the same quantity would likely result in a dry, dense mug cake.
If you want to use coconut flour, the recipe would need to be reformulated with a different flour-to-liquid ratio.
Can I use coconut sugar instead of maple syrup?
You can, but it isn’t a direct substitution. Maple syrup adds both sweetness and moisture to the batter, whereas coconut sugar is a dry ingredient.
Because keeping the mug cake soft is important, I prefer maple syrup in this recipe. If you use coconut sugar, you may need to adjust the liquid to compensate.
Can I make this recipe with a different protein powder?
Yes, but keep in mind that the texture may vary. Whey, plant-based and blended protein powders can all behave differently when mixed with liquid and heated.
If you’re changing the protein powder, pay attention to the consistency of the batter before microwaving. If it seems unusually thick, add a small amount of extra milk rather than adding more liquid all at once.
Protein Powder Mug Cake Nutrition Facts
Each mug cake is one serving, but the nutritional values vary because the ingredients differ. The estimates below are for one finished mug cake.
Chocolate Chip Protein Mug Cake: 255 calories | 20 g protein | 32 g carbohydrates | 7 g fat
Biscoff Chocolate Protein Mug Cake: 310 calories | 21 g protein | 38 g carbohydrates | 10 g fat
Strawberry White Chocolate Protein Mug Cake: 265 calories | 20 g protein | 33 g carbohydrates | 7 g fat
These are estimated values and can vary depending on the specific brands and products used, particularly the protein powder, chocolate chips, Biscoff spread and milk.
More Protein and Mug Cake Recipes You’ll Love
If you love quick, single-serving desserts, here are a few more recipes to try.
For a classic chocolate treat, try my chocolate chip mug cake.
If you’re more in the mood for breakfast, my pancake in a mug recipe is another quick single-serving recipe.
And if you’re craving something extra chocolatey, my hot chocolate mug cake is a cozy option.
Hey! If you make this recipe, I would love it if you could leave me some feedback and a rating ⭐⭐⭐⭐⭐ in the comment section at the bottom of the page! Also let me know on Facebook, Instagram or Pinterest! I can’t wait to hear your thoughts and see your photos!
Protein Powder Mug Cake Recipe
Equipment
- Fork or Spoon
- Mug or Ramekin
Ingredients
Chocolate Chip Protein Mug Cake
- 20 g vanilla protein powder
- 20 g oat flour
- ¼ teaspoon baking powder
- 15 g maple syrup
- 65 ml unsweetened almond milk
- ¼ teaspoon vanilla extract
- 10 g chocolate chips
Biscoff Chocolate Protein Mug Cake
- 20 g chocolate protein powder
- 20 g oat flour
- 8 g unsweetened cocoa powder
- ¼ teaspoon baking powder
- 15 g maple syrup
- 65 ml unsweetened almond milk
- 10 g Biscoff spread
- 5 g chocolate chips
Strawberry White Chocolate Protein Mug Cake
- 20 g vanilla protein powder
- 20 g oat flour
- ¼ teaspoon baking powder
- 15 g maple syrup
- 65 ml unsweetened almond milk
- ¼ teaspoon vanilla extract
- 20 g finely chopped strawberries
- 10 g white chocolate chips
Instructions
Chocolate Chip Protein Mug Cake
- Add the protein powder, oat flour and baking powder to a microwave-safe ramekin or mug. Stir to combine.
- Add the maple syrup, almond milk and vanilla extract. Stir until you have a smooth batter with no dry pockets.
- Stir in the chocolate chips.
- Microwave for 45-60 seconds, or until the cake is cooked through but still soft in the center.
- Allow to rest for 1 minute before eating.
Biscoff Chocolate Protein Mug Cake
- Add the chocolate protein powder, oat flour, cocoa powder and baking powder to a microwave-safe ramekin or mug. Stir to combine.
- Add the maple syrup and almond milk and mix until smooth.
- Stir in the chocolate chips and Biscoff spread.
- Microwave for 45-60 seconds, or until cooked through but still soft.
- Allow to rest for 1 minute before eating.
Strawberry White Chocolate Protein Mug Cake
- Add the protein powder, oat flour and baking powder to a microwave-safe ramekin or mug. Stir to combine.
- Add the maple syrup, almond milk and vanilla extract. Stir until smooth.
- Gently fold in the finely chopped strawberries and white chocolate chips.
- Microwave for 50-65 seconds, or until the cake is cooked through but still soft in the center.
- Allow to rest for 1 minute before eating.
Notes
- Chocolate Chip: 255 kcal, 20 g protein, 32 g carbohydrates, 7 g fat
- Biscoff Chocolate: 310 kcal, 21 g protein, 38 g carbohydrates, 10 g fat
- Strawberry White Chocolate: 265 kcal, 20 g protein, 33 g carbohydrates, 7 g fat
- Do not overcook the mug cake. It should be just cooked through and still soft. Microwave times can vary between appliances, so start with the lower end of the cooking time.
- I recommend using a ramekin or small microwave-safe mug with enough room for the batter to rise.
- The strawberry version takes slightly longer because of the additional moisture from the fresh strawberries.
- For the best texture, enjoy the mug cake shortly after making it.
Nutrition
Let me know if you make this Protein Powder Mug Cake Recipe!
