OK. You don't need paper to bake sweet potatoes in the microwave. You can use a fork to poke a few small holes on the surface of the sweet potatoes, and then heat them in the microwave. Microwave oven (microwave oven/microwave), as its name suggests, is a modern cooking stove that uses microwaves to heat food. Microwave is a kind of electromagnetic wave. Microwave oven consists of power supply, magnetron, control circuit and cooking cavity.