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.
Cook's Notes:
Cottage cheese can be substituted for the ricotta cheese if desired.
Hamburger can be substituted for the sausage.