There are different ways you can achieve a crispy muffin top! Simply sprinkling granulated white sugar or brown sugar on top before baking, will help the top become crisp. Another way is to place the oven rack in the top two thirds of the oven and start the baking at 425 degrees f. Bake at this high temperature for about 10 minutes. Then reduce the temperature to 375 degrees f for the remaining baking time.