Why do potatoes go hard in the microwave?

Potatoes do not go hard in the microwave. In fact, microwaves are often used to cook potatoes because they cook them quickly and evenly. If your potatoes are coming out hard from the microwave, it is likely because they are not being cooked for long enough. Potatoes should be cooked in the microwave on high power for 3-5 minutes per pound, depending on the size of the potatoes. You can check to see if the potatoes are done by inserting a fork or knife into them. The potatoes are done when the fork or knife can be easily inserted into the potatoes.