Preheat the oven to 375 degrees F. Line a rimmed baking sheet with parchment paper and brush the parchment with olive oil.
Blend the cottage cheese, eggs, oat flour, Parmesan, cornstarch, garlic powder, Italian seasoning, and salt until completely smooth.
Pour the batter onto the prepared baking sheet and spread it into an even 10 x 13-inch rectangle. Keep the edges slightly thicker so they do not become brittle.
Bake for 25 to 30 minutes, until the center is set and the edges are deep golden brown.
Let the flatbread cool on the pan for 10 minutes, then carefully release it from the parchment. For a firmer finish, return it directly to the oven rack for 3 to 5 minutes before serving.