Preheat oven to 375°F. In a large skillet over medium-high heat, cook ground beef and onion until no longer pink, 6 to 8 minutes. Add garlic, Italian seasoning, salt, and pepper; cook 1 minute. Stir in marinara and simmer 2 minutes.

In a bowl, beat cream cheese, sour cream, 1 cup mozzarella, and parmesan until smooth.

Spread half the meat sauce in a 9x13 dish. Layer half the ravioli, then the cream cheese mixture. Top with remaining ravioli, remaining sauce, and the last cup of mozzarella.

Cover with foil and bake 25 minutes. Uncover and broil on high 2 to 3 minutes until bubbly and golden. Let rest 5 minutes before serving.