
Bread, rolls, and muffins
Microwaving bread turns it rubbery because heat changes its sugar structure. Once it hits 212°F, the sugars crystallize, making the bread chewy and hard. This can happen with muffins and donuts too. Instead, reheat bread in the oven by wrapping it in foil, or use a skillet for slices, flipping them frequently. For the best result with slices, use a toaster.