Italian Bake Casserole

cooked diced chicken

cooked Italian sausage links, cut in ¼-inch slices

jar (26 oz) spaghetti sauce (you can use more if you like a saucy casserole)

shredded mozzarella or parmesan cheese

penne pasta (or any shape you have on hand), cooked al dente

onion, chopped

large diced bell peppers--I mixed red and green

shredded pizza cheese (see NOTES)

shredded Asiago cheese