Microwave at highest setting for aproxiamtely 90 seconds. Please note that cooking times vary depending on your microwave and you will need to watch the batter as it cooks. I find that once you notice the batter rise to it's highest point, give it an additional 20 seconds in the microwave and quickly check to see if the cake springs back when you press the center of the batter. If it does not spring back, microwave at 15 second intervals and checking every time until it does so. Do not over-cook otherwise it'll dry out.