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