Preheat your oven to 180°C (350°F). Grease a medium 6-cup muffin tin with cooking spray or line it with muffin liners for easy removal.
If your cottage cheese isn’t already smooth, blend it in a food processor or blender until it reaches a creamy, smooth consistency.
In a large mixing bowl, whisk together the smooth cottage cheese, eggs, liquid sweetener, milk, and vanilla extract until fully combined.
Add in the all-purpose flour, baking powder, and a pinch of salt. Fold into the wet ingredients until just combined.
Gently fold in the blueberries, taking care not to crush them. If desired, toss the blueberries in a little flour before folding them in to help prevent them from sinking.
Spoon the batter into the prepared muffin tin, filling each cup about 2/3 full.
Bake for 30-35 minutes, or until a toothpick inserted into the center of a muffin comes out clean. The muffins should be golden brown and spring back when gently pressed.
Let the muffins cool in the tin for 5 minutes, then transfer to a wire rack to cool completely.