Preheat oven to 375 degrees F (190 degrees C).
Combine ricotta cheese, 1/2 of the mozzarella cheese, Parmesan cheese, egg, and Italian seasoning in a bowl.
Cook sausage in a skillet over medium heat until no longer pink, 5 to 10 minutes; drain. Stir in marinara sauce.
Spread 1/6 of the cheese mixture evenly on each flatbread; cover with sausage mixture. Top with remaining mozzarella cheese.
Bake in the preheated oven until cheese is melted and bubbly, 10 to 15 minutes.
Cottage cheese can be substituted for the ricotta cheese if desired.
Hamburger can be substituted for the sausage.
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