This will depend on your microwave power. I found that cooking for exactly 1 minute works best with my 900-watt microwave. If you do not know the power of your microwave, check the door or the back of the microwave. If your microwave is higher power, decrease the power by 10% for every 100 watts (for example, if your microwave is 1,200 watts, cook this cookie for 1 minute at 70% power). If your microwave is lower power, increase the cooking time by 10 seconds for each 100 watts (for example, if your microwave is 600 watts, cook the cookie for 1 minute 30 seconds).