01 - Preheat your oven to 350°F. Line a 12-cup muffin tin with paper liners or lightly grease it with cooking spray.
02 - In a medium bowl, whisk together the all-purpose flour, vanilla protein powder, baking powder, baking soda, and salt until thoroughly combined.
03 - In a large bowl, whisk together the Greek yogurt, eggs, milk, oil, sugar, and vanilla extract until the mixture is smooth and well-blended.
04 - Add the dry ingredients to the wet mixture and stir gently with a spatula until just combined. Be careful not to overmix as this can result in dense muffins.
05 - Toss the blueberries with 1 tablespoon of flour in a small bowl to coat them evenly, which prevents them from sinking to the bottom during baking.
06 - Gently fold the flour-coated blueberries into the batter, being careful not to crush them.
07 - Divide the batter evenly among the 12 muffin cups, filling each about 3/4 full using an ice cream scoop or spoon.
08 - Bake for 18 to 22 minutes, or until a toothpick inserted into the center of a muffin comes out clean or with just a few moist crumbs.
09 - Let the muffins cool in the pan for 5 minutes, then carefully transfer them to a wire rack to cool completely before serving.