In a large skillet over medium heat, brown the ground beef until it is no longer pink. Drain any excess fat.
Meanwhile, cook the tortellini according to the package instructions. Drain and set aside.
In a large bowl, mix together the marinara sauce, heavy cream, garlic powder, Italian seasoning, salt, and pepper until well combined.
In a large baking dish, combine the cooked tortellini, browned beef, and the sauce mixture. Stir to ensure everything is evenly coated.
Sprinkle the mozzarella and Parmesan cheese evenly on top.
Bake uncovered at 375°F (190°C) for 20–25 minutes, or until the dish is bubbly and golden.
If desired, garnish with fresh parsley and serve hot.
