Thinly slice bell pepper and onion. Preheat medium sie skillet with about 1 tspn olive oil and sear vegetables for about 3 minutes. Add peeled and chopped garlic and and add to the pan. cook for additional 1 minute.
Add ground beef to the pan and mix it until well crumbled, browned and cooked through( about 7-10 min)
Add cream to the pan and heat it there without boiling. Turn the heat off and add cheese.
Add cooked pasta to the pan and mix well. Garnish with chopped green onions and more parmegiano