Preheat the oven to 350°F. Lightly grease an 8x8” baking dish with nonstick spray.
Blend rolled oats into oat flour using a blender or food processor. Skip this step if using almond flour.
In a blender, combine cottage cheese, eggs, syrup, vanilla extract, lemon juice, and protein powder. Blend until smooth.
Add the oat flour, cinnamon, baking powder, and salt. Stir until just combined.
Gently fold in the blueberries.
Pour the mixture into the prepared baking dish and smooth out the top.
Bake for 35–40 minutes, or until the center is set and the top is lightly golden. The bake should begin to pull away from the sides.
Let cool slightly before slicing into 4 servings. Enjoy warm or cold. Optional: sprinkle with powdered monk fruit or drizzle with syrup.