Preheat your oven to 350°F (175°C).
Prepare your muffin tin by greasing it or lining it with muffin liners.
In a large mixing bowl, combine the whole wheat flour, protein powder, rolled oats, baking powder, baking soda, and salt. Whisk until well blended.
In another bowl, mix the honey (or maple syrup), unsweetened applesauce, and eggs. Whisk until smooth.
Gently fold the blueberries into the wet mixture, then pour it into the bowl with the dry ingredients.
Fill each muffin cup about two-thirds full with the batter.
Bake for 18-20 minutes, or until a toothpick inserted comes out clean.
Let the muffins cool in the tin for about 5 minutes, then transfer to a wire rack to cool completely.