Preheat the oven to 350°F and line a baking sheet with parchment paper.
Blend the cottage cheese until completely smooth. Add the egg, maple syrup, melted butter, and vanilla extract, then blend until combined.
Whisk the vanilla protein powder, oat flour, all-purpose flour, baking powder, and salt in a large bowl.
Pour the blended cottage cheese mixture into the dry ingredients and stir until a soft dough forms. Fold in the sprinkles without overmixing.
Chill the dough for 25 minutes so it becomes firm enough to scoop.
Scoop 12 portions onto the prepared baking sheet and gently flatten each one with damp fingertips.
Bake for 11 to 13 minutes, until the edges are lightly golden. Cool the cookies on the baking sheet for 10 minutes before moving them to a rack.