1. Bring a large pot of salted water to a boil and cook the tortellini according to package directions. Drain and set aside.

2. Heat the olive oil in a large skillet over medium heat. Add the ground beef and cook until browned, breaking it apart as it cooks. Drain excess grease if needed.

3. Add the diced onion and cook for 3 to 4 minutes until softened. Stir in the garlic and cook for 30 seconds.

4. Stir in the marinara sauce, tomato paste, Italian seasoning, red pepper flakes, salt, and black pepper. Simmer for 5 to 7 minutes.

5. Lower the heat and stir in the heavy cream and Parmesan cheese until the sauce is smooth and creamy.

6. Add the cooked tortellini to the skillet and toss gently until fully coated in the sauce.

7. Sprinkle with fresh parsley and serve hot with extra Parmesan if desired.