Preheat oven to 375 degrees Fahrenheit (190 degrees Celsius) and grease a 12-cup muffin tin or line with silicone liners.
In a large bowl, whisk together the oat flour, vanilla protein powder, baking powder, baking soda, and salt until well aerated.
In a separate medium bowl, combine the Greek yogurt, eggs, applesauce, maple syrup, and vanilla extract; whisk until the mixture is smooth and emulsion is achieved.
Incorporate the wet ingredients into the dry ingredients using a spatula, folding gently until no dry streaks remain; do not overwork the batter.
Gently fold the fresh blueberries into the batter until evenly distributed.
Divide the batter equally among the 12 muffin cups, filling each to approximately 80 percent capacity.
Bake for 18 to 22 minutes, or until an internal temperature of 200 degrees Fahrenheit is reached and a toothpick comes out clean.
Cool the muffins in the tin for 5 minutes before transferring to a wire rack for final cooling.