Summarize the following:
Stack your plates and put them in the microwave. Keep your microwave on its regular setting and heat them for 30 seconds per plate. Once they are finished, use an oven mitt to remove the plates since they will get hot. Preheat your oven to the lowest setting, usually around 150 to 200 °F (66 to 93 °C). Once the oven is hot, place your stacked plated inside and leave them there for a couple minutes. Use an oven mitt to take them out of the oven and let them cool slightly before serving. Use a toaster oven that's large enough to fit your plates if you want to preserve energy. Plate warmers look like a large foldable heating pad that you can stack plates on. Plug the plate warmer in and turn it on. Wrap the entire plate in the warmer and then place another plate on top. Continue stacking the rest of your plates to heat them thoroughly for 5 minutes before you serve your food.  Plate warmers can be purchased online or in kitchen specialty stores. In a pinch, you can use a large heating pad meant for backs. These can be purchased at your local pharmacy.

Summary:
Microwave the plates to heat them quickly. Put the plates in the oven at its lowest setting if they are oven-safe. Purchase an electric plate warmer so you can still use your appliances.