Can you put an empty coffee cup in the microwave?

Yes, you can put an empty coffee cup in the microwave, but it’s generally not recommended. Microwaving an empty cup can cause it to overheat and potentially crack or break, especially if it's made of ceramic or glass. Additionally, the lack of liquid means there’s no content to absorb the microwave energy, which can lead to uneven heating. It's safer to heat a cup with liquid inside.