How long should you put a muffin in the microwave?

To heat a muffin in the microwave, place it on a microwave-safe plate and heat it for about 15 to 30 seconds on medium power. Check for warmth, and if it’s not heated through, continue in 10-second increments until it's to your liking. Be careful not to overheat, as this can make the muffin tough or rubbery.