Start by melting butter in frypan on medium heat and adding the onions and celery. Stir occasionally till translucent. While that is cooking, mix sour cream, egg and old bay in a bowl. Add crabmeat and toss. Add crackers, bread, cheese and celery and onion mixture. Refrigerate for AT LEAST 20 minutes. Form into "cakes/patties" and panfry in butter till browned and heated through on both sides or bake on a lightly greased baking sheet at 375 for 5 to 7 minutes each side - till brown and heated through.