This delicious meal combines pizza flavors and two kinds of cheese to make a fabulous sauce for pasta. The sauce is cooked in the slow cooker. Combine the sauce with the pasta and cheeses and finish the dish in the slow cooker--or transfer everything to a baking dish, top with the remaining cheese, and bake the casserole in the oven. The sauce is versatile; use the bell peppers or omit them, or add sliced mushrooms to the sauce. If your family has favorite pizza toppings, try to incorporate them in the sauce or topping.