I am making coffee cake but I don’t have any sour cream. the recipe requires 1/2 sour cream. I was told there was some in my fridge in the basement. but there is none. people said you could use yogurt. But my yogurt went mouldy. people said you could use buttermilk. But i only have 1% milk that says it tastes like 2%. I need help! What can yo do instead of sour cream? thnx!