To make stuffed shells, cook your pasta as directed on the box. For the filling, combine eggs, ricotta cheese, spinach / bacon / ground beef / whatever you want to use, salt and pepper, mozzarella and parmesan cheese. Put some marinara sauce on your baking dish. Stuff the filling into your cooked pasta and put the pasta on a single layer on your baking dish. Top with more mozzarella and parmesan cheese and bake at 375 degrees for 30 minutes or until golden brown and the cheeses have melted.