Dont overheat or overcook items. It increases the chances of burning yourself, ruining the food or setting the microwave on fire. When in doubt, cook in short bursts, checking items frequently. The microwave process shortens and tightens the protein, or the gluten in wheat, drying and toughening the product. Theres exceptions, but usually a tender, more flavorful dish can be done using conventional heat. Reheat breads very briefly, wrapped in a damp paper towel.