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 fully incorporated.
04 - Add the dry ingredients to the wet mixture. Stir gently with a spatula until just combined, being careful not to overmix.
05 - Toss blueberries with 1 tablespoon flour in a small bowl to coat evenly, preventing them from sinking during baking.
06 - Gently fold the coated blueberries into the batter using a spatula, taking care not to crush the fruit.
07 - Divide batter evenly among the 12 muffin cups, filling each approximately 3/4 full.
08 - Bake for 18-22 minutes until a toothpick inserted into 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 before serving.