01 - Preheat oven to 350°F. Line a 12-cup muffin tin with paper liners or grease lightly.
02 - Whisk together flour, protein powder, baking powder, baking soda, and salt in a medium bowl until well blended.
03 - Whisk Greek yogurt, eggs, milk, oil, sugar, and vanilla extract in a large bowl until smooth and creamy.
04 - Add dry ingredients to wet mixture. Stir gently until just combined—do not overmix to maintain tender texture.
05 - Toss blueberries with 1 tablespoon flour to prevent sinking during baking.
06 - Gently fold floured blueberries into the batter until evenly distributed.
07 - Divide batter evenly among muffin cups, filling each approximately 3/4 full.
08 - Bake for 18 to 22 minutes until a toothpick inserted into the center comes out clean.
09 - Let muffins cool in the pan for 5 minutes, then transfer to a wire rack to cool completely.