1 x 500 g package of Ziti Pasta
10-14 oz. (300 - 400 mL) tomato Sauce
4 oz. shredded mozzarella
7 oz. shredded parmensan cheese
1 red pepper - chopped, medium diced
1 medium Spanish onion - diced
2 Tbsp (30 mL) unsalted butter
Salt and pepper, to taste