Creamy Spinach and Tortellini

1 lb. uncooked fresh cheese tortellini
2 T. olive oil
1/2 c. chopped onion
3 cloves garlic, minced
1 bag of fresh spinach or 9 oz. frozen spinach
1 c. cubed seeded tomato
1/4 c. chopped fresh basil or 1 1/2 tsp. dried (I sometimes substitute parsley)
1/2 tsp. salt
1/2 tsp. pepper
1 c. whipping cream
1/4 c. grated parmesan or romano cheese

Cook tortellini according to package directions. Set aside. Heat oil in skillet. Cook onion and garlic about 5 minutes. Add spinach, tomato, basil, salt and pepper. Cook 5 minutes. Stir in cream and cheese. Add cooked tortellini. (The longer you let this sit, the thicker the sauce will get!)