01 -
Preheat your oven to 375°F (190°C). Grease a 9×13-inch baking dish with nonstick spray or a little olive oil.
02 -
In a large skillet over medium heat, cook the ground beef and onion until the meat is browned and the onion is softened, about 5-7 minutes. Drain any excess fat. Add the minced garlic and cook for 1 minute, until fragrant. Stir in the marinara sauce and simmer for 5 minutes. Remove from heat and set aside.
03 -
In a medium bowl, combine the ricotta cheese, sour cream, cream cheese, egg, parsley, salt, and pepper. Mix until smooth and creamy.
04 -
Spread a thin layer of the meat sauce on the bottom of the prepared baking dish. Arrange half of the ravioli in a single layer over the sauce. Spread half of the ricotta mixture over the ravioli, followed by half of the remaining meat sauce. Sprinkle with 1 cup of mozzarella cheese. Repeat the layers with the remaining ravioli, ricotta mixture, meat sauce, and finish with the remaining mozzarella and Parmesan cheeses.
05 -
Cover the casserole with aluminum foil and bake in the preheated oven for 30 minutes. Remove the foil and bake for an additional 10-15 minutes, or until the cheese is melted and bubbly.
06 -
Let the casserole cool for 5-10 minutes before serving. Garnish with extra parsley if desired.