1. Prepare tortellini according to package directions.
2. Preheat olive oil in a large skillet on medium-high heat. Sauté meatballs and peppers and onions for 3 to 4 minutes.
3. Mix in marinara sauce, cover and simmer for 10-12 minutes, stirring occasionally.
4. Stir in prepared tortellini and simmer 5-7 minutes.
5. Serve and sprinkle with Parmesan cheese.