Like if a put a toast with jam on top in the microwave and warm it up altogether, jam feels a lot hotter than bread. Why?
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Microwaves, specifically, tend to heat things unevenly. That’s because microwaves work by causing the water within the food to vibrate, and so are dependent on having (liquid) water available in order to heat foods. In foods where available water is very uneven (say, the water-based gel of your jam + the relatively dry bread), parts of the food with high water content will heat up first and faster.
Also, not part of the explanation, but why the hell are you putting toast in a microwave?
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