Preheat oven to 325 degrees. Mix cream cheese,sour cream,mayonnaise until well blended. Add remaining ingredients except for the crab meat and 1/2 cup cheddar cheese,mixing until fully blended.Add crabmeat,mixing thoroughly.
Pour into a medium size baking dish and sprinkle remaining cheese on top. Bake 30 minutes,uncovered.Let stand 15-20 minutes before serving with your favorite types of crackers.