Press sauté. Add beef, onion, and garlic and cook until meat is browned.
Press cancel. Add mushrooms, bell peppers, spices, broth, and spaghetti. Program for manual-high and 4 minutes.
Use quick release (QR) to release the pressure, remove lid, and stir in spaghetti sauce and tomatoes. Program for manual-high zero min. This will just get it up to pressure and then stop.
Use quick release again and add salt and pepper to taste.
Serve in mugs or bowls with mozzarella or parmesan cheese sprinkled on top.