One of the biggest reasons mug cakes turn out rubbery is overcooking. Unlike traditional oven-baked cakes, mug cakes cook extremely fast, often in under two minutes. However, if left in the microwave ...

Avoid using tall and skinny mugs, as they make it difficult for the cake to cook evenly in the microwave. The shape and size of your mug dramatically affects how evenly your cake cooks. A wide, ...