1 (6 oz.) pkg. crabmeat
1 can cream of mushroom soup
1 c. milk
1 c. uncooked small sea shell macaroni
1 c. grated cheddar cheese
2 tbsp. grated onion

Combine all ingredients in a 1 1/2 quart casserole; cover and refrigerate overnight. Bake at 350 degrees about an hour or until macaroni is tender.