Preheat oven to 350°F (175°C) and grease a 12-cup muffin tin or line with paper liners.
In a large mixing bowl, whisk together oat flour, protein powder, baking powder, and salt.
In a separate medium bowl, whisk eggs, Greek yogurt, maple syrup, vanilla extract, and almond milk until smooth.
Pour the wet ingredients into the dry ingredients and stir until just combined; do not overmix.
Gently fold in the fresh blueberries using a spatula.
Distribute the batter evenly among the 12 muffin cups.
Bake for 18 to 22 minutes, or until a toothpick inserted into the center comes out clean.
Allow muffins to cool in the tin for 5 minutes before transferring to a wire rack to cool completely.