3. Disinfecting Plastic Cutting Boards

Wash the board well, rub it with the cut side of a lemon, then heat for 1 minute.

4. Making Potatoes

While the microwave won't give you a baked potato with a crisp skin, it will cook the average russet in about 4 minutes. You can simultaneously cook as many as will fit. (The general rule for heating more food is to check for doneness every 30 seconds beyond the regular cooking time.) Prick the potatoes all over with a fork and cook for 2 minutes. Turn them over and cook for 2 to 3 minutes longer. If you're making mashed potatoes, also heat the milk in the microwave before adding it. (Cold milk makes for cold mashed potatoes.)

5. Softening Brown Sugar

Keep the sugar in its plastic packaging, add a few drops of water, and heat on medium for 10 to 20 seconds.