These are a little time consuming to make – but worth it!
SAUCE
Brown sausage and onion, drain fat. Mix in spinach and all other ingredients except for 2 cups mozzarella. Cook shells according to directions. Stuff shells well with mixture and place open side down. Pour prepared sauce over shells. Bake at 350 degrees for 40 minutes covered with aluminum foil. Uncover, sprinkle 2 cups mozzarella on top and bake 5 minutes more. Let stand 5-10 minutes before serving.
Find it online: https://www.kitchenkreative.com/stuffed-shells/