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