Cook sausage, bell peppers, onions, Italian seasoning, and red pepper flakes in oil in large skillet until sausage is browned and vegetables are tender, 8 to 10 minutes. Stir in remaining ingredients and cook, covered, over medium heat until tomatoes are softened, about 5 minutes.
Serving Size 1 cup
* Percent Daily Values are based on a 2,000 calorie diet. Your daily value may be higher or lower depending on your calorie needs.