3 shells sauce no meat Recipes

jumbo pasta shells, cooked and drained, light ricotta cheese (use full amount if not using meat or for extra cheesey), cooked sausage, crumbled (optional), part-skim mozzarella cheese, shredded, divided, fresh parsley leaves, packed, very finely chopped, fresh romano cheese or 1/4 cup parmesan cheese, grated, egg, minced garlic (optional) or 2 tsp garlic powder (optional), nutmeg, grated, black pepper , to taste, marinara sauce or 1 (26 oz) jar homemade pasta sauce

roma tomatoes, onion (minced or chopped ), canned tomato sauce, dried oregano, dried basil, black pepper (or less depending on how spicy you want it), olive oil, pasta shells