There are three tips I recommend for getting a perfect cake every time in the microwave: 1) Make sure your microwave is on high power. It should be at 800W. 2) You need at least an 10oz coffee mug. If it's smaller than that, your mug cake will overflow, larger than that, and your mug cake may be dry if you don't decrease the cooking time. 3) Depending on how powerful your microwave is, you may need to cook your mug cake longer (if it's lower power, you'll need a longer cook time). Cook your mug cake in 10 second increments after the 60 second mark until it's moist, fluffy and not runny anymore.