Preheat the oven to 350°F and line a baking sheet with parchment paper.
Blend the cottage cheese, egg, honey, melted butter, and vanilla extract until smooth and creamy.
Whisk the protein powder, all-purpose flour, oat flour, baking powder, cream of tartar, and salt in a bowl.
Stir the cottage cheese mixture into the dry ingredients until a thick, sticky dough forms.
Mix the granulated sugar and cinnamon in a small bowl. Chill the cookie dough for 20 minutes.
Roll the dough into 12 balls, coat each ball in the cinnamon sugar, and place them on the baking sheet. Flatten them slightly.
Bake for 11 to 13 minutes, until the tops look set and the edges are lightly golden. Let the snickerdoodles cool for 10 minutes before serving.