Heat a large skillet over medium-high heat. Cook and crumble the sausage for 3-4 minutes until no longer pink. Stir in the marinara sauce and Italian seasoning. Bring to a simmer, then remove from the heat.
Add 1 cup of the meat sauce to the bottom of a 9x9 casserole dish.
Add half the ravioli, followed by half of the remaining meat sauce, and then half of the ricotta and mozzarella.
Top with the remaining ravioli, then the meat sauce, then the cheese.
Bake for 35-40 minutes until the cheese is lightly browned and the sides ae bubbling up. Enjoy!