Preheat the oven to 425 F. Line a baking sheet with parchment paper and lightly brush it with the olive oil.
Blend the cottage cheese, mashed sweet potato, and egg until smooth and uniform.
Combine the oat flour, tapioca flour, psyllium husk, baking powder, rosemary, and salt. Stir in the cottage cheese mixture until a thick, soft dough forms.
Let the dough rest for 12 minutes. Spread it into a 12-inch circle about 1/4-inch thick, smoothing the surface with a lightly dampened spatula.
Bake for 20 to 23 minutes, until the surface is dry and the edges are browned. Turn the crust over and remove the parchment.
Bake for another 7 to 9 minutes, until the second side develops golden spots. Cool for 5 minutes before topping so the crust can finish setting.