But it's a major calorie bomb. According to the USDA, mayonnaise has 680 calories per 100 grams. If you replace mayo with sour cream, per the USDA, you'll cut down the calorie count to just 198 ...
According to FatSecret’s food database and calorie counter, the item is 1,530 calories ... melted cheddar cheese, ketchup and mayonnaise served on a toasted bakery-style bun.