This recipe for a cup-style yogurt cake uses only three ingredients and requires no gelatin or heavy cream. It's foolproof and requires minimal cleanup, as it only requires using a microwave and refrigerator. The chewy, smooth texture is perfectly complemented by the gentle sweetness of the marshmallows and the refreshing taste of the yogurt. The key is to thoroughly melt the marshmallows and carefully remove the cake from the cup. This easy and delicious dessert is perfect for making with children.