Storing Information:I don't recommend storing mug cakes for long. Since these taste best when fresh.If you are required to keep them for a few hours, store them at room temperature covered tightly at all times. I use cling wraps to cover the mugs.Add ins: Apart from chocolate chips you can also add Nutella, Biscoff, Peanut butter or any other spread of choice in the center of cake batter before cooking it. You don't need to push the spread down as the cake will cover it when it bakes.Tips to...