Do you want to use a special plate or a special lunch box to cook in the microwave oven, or just use the plates and bowls that hold food at home?
It is best to use special plates and lunch boxes suitable for microwave heating. Stainless steel cannot be used. Porcelain can be used if it is underglaze or underglaze color, and it can't be used because the overglaze color will be toxic when heated. Nowadays, porcelain is usually marked with underglaze color, underglaze color or underglaze color at the bottom, or "microwave heating is applicable", so you can see it clearly when you buy it.