Preheat the oven to 350°F and line a baking sheet with parchment paper.
Blend the cottage cheese, egg, sugar, melted butter, and vanilla extract until completely smooth.
Whisk the vanilla protein powder, all-purpose flour, oat flour, matcha powder, baking powder, and salt in a bowl.
Stir the blended cottage cheese mixture into the dry ingredients until a thick dough forms.
Fold in the white chocolate chips, then chill the dough for 25 minutes.
Scoop 12 portions onto the baking sheet and flatten each cookie gently.
Bake for 11 to 13 minutes, until the edges are lightly golden and the centers are set. Cool for 10 minutes before serving.