Sausage and Spinach Stuffed Shells

INGREDIENTS

1 12 ounce package

jumbo pasta shells

1 tbsp

olive oil

1 cup

yellow onion, finely chopped

1 lb

Italian sausage, casings removed

3 cloves

garlic, minced

large egg, lightly beaten

1 15 ounce container

ricotta cheese

6 oz

fresh spinach, chopped OR 10 oz. frozen chopped spinach, thawed and drained

1 cup

freshly grated Parmesan cheese, divided

1 tbsp

chopped fresh basil or 1 tsp. dried basil

1/4 cup

bread crumbs

1/2 tsp

salt

1/2 tsp

pepper

1 28 ounce can

chopped tomatoes with herbs, including the liquid