In a large saucepan, melt the butter and saute the onion until translucent, 3 to 4 minutes. Add the soups, milk, and half-and-half. Add the crabmeat and bring just to a boil. Add the sherry and salt and pepper, to taste. Serve immediately. Or allow to cool to room temperature, then refrigerate or freeze immediately in plastic microwavable reusable containers with lids.
Recipe courtesy of Paula Deen