In general, a microwave is more energy-efficient than a toaster oven for cooking or heating small food items. The main reason for this is the way these appliances work and the heating mechanisms they use.
Microwave ovens use electromagnetic waves to directly heat the water molecules inside the food. This process is very efficient and allows the food to be heated quickly and evenly. Microwaves are particularly efficient when it comes to tasks like reheating leftovers, heating beverages, or cooking small portions of food.
On the other hand, toaster ovens use electric heating elements, similar to conventional ovens, to cook or toast food. These heating elements take longer to heat up and distribute heat, and some energy is lost during this process. Toaster ovens are generally better suited for cooking larger food items or dishes that require browning or crisping.
So, if you're looking for an energy-efficient option for quick tasks like reheating or heating small food items, a microwave is the better choice. However, if you're cooking larger meals or need to achieve browning or crisping, a toaster oven might be more suitable, even though it might be slightly less energy-efficient for those specific tasks. In any case, both appliances are relatively energy-efficient compared to traditional ovens, so using either one wisely can help save energy and reduce your overall energy consumption.