Sloppy Joe Casserole Preheat oven to 350 Cook for 45 minutes 1 1/2 Ibs Ground Beef 1 Med Onion chopped 1 Box Medium Shells 24 Oz. Cottage Cheese 2 15oz. Cans Sloppy Joe 2 Cups Shredded Mozzarella Cheese Lightly Grease a 9 x 12 pan Brown ground beef with Onion. Add sloppy joe cans. Cook shells as directed on package. Layer two times as follows: 1/2 shells, 1/2 cottage cheese, 1/2 Meat mixture. End with shredded cheese. Cover with aluminum foil.