1. Preheat the Oven: Start by preheating your oven to 375°F and grease a 9×13-inch baking dish.

2. Cook the Tortellini: Prepare the tortellini according to the package instructions, then drain and set aside.

3. Cook the Ground Meat: In a skillet over medium heat, cook the ground beef or turkey until browned. Drain any excess fat.

4. Combine the Sauce: Stir the marinara sauce, cream cheese, and sour cream into the cooked ground meat until the mixture is smooth and creamy.

5. Assemble the Casserole: Layer half of the cooked tortellini in the prepared baking dish, then pour half of the meat mixture over the top. Sprinkle half of the Parmesan and mozzarella cheeses over the layers. Repeat the layers.

6. Bake to Perfection: Cover the casserole with foil and bake for 25 minutes. Remove the foil and bake for an additional 10 minutes, or until the cheese is melted and bubbly.

7. Serve and Enjoy: Allow the casserole to cool for a few minutes before serving. Savor the creamy, cheesy goodness of this comforting dish!