Heat large, deep skillet over medium heat. Cook sausage for about 5 minutes, until brown. Flip and brown on the other side. Remove from skillet.
Add olive oil to pan and saute bell peppers for about 5 minutes. Add diced tomatoes , basil, oregano, parsley and red pepper flakes. Cover skillet with lid for 15 minutes and reduce heat to low. Stir occasionally.
Add onion, garlic and sausage back to skillet. Cover and cook for another 10-15 minutes until onions are soft and sausage is cooked through.
Serve with cauliflower rice or egg noodles.