50min · 6 servings 1 lb Penne Pasta 2 tbsp Olive Oil 1/4 Onion diced 2 clove Garlic minced ¼ tsp Red Pepper Flakes 1 lb Italian Sausage sweet, casings removed 28 oz Diced Tomatoes with juice or sauce ½ tsp Oregano dried 1 tsp Basil fresh, chopped 2 cups Whole Milk Mozzarella Cheese Shredded 2 cups Fontina Cheese Shredded ¾ cup Pecorino Romano Cheese grated 1 Egg beaten Salt and Pepper to Taste