2 C crabmeat, uncooked
1 C shell macaroni
1 small onion, chopped fine or grated
1 can cream mushroom soup
1 soup can milk
1/2 C grated medium cheddar cheese
1 C bread crumbs
1/4 C butter

Mix bread crumbs and melted butter together and set aside. Mix all other ingredients together, put in casserole dish, put dish in refrigerator for at least 2 hours or overnight. Put breadcrumb mixture over top of casserole and bake at 350°F for 45 mins. or until lightly browned and bubbly.