If you bake homemade breads/cinnimon rolls/muffins, etc...
If you have extra, freeze them... when you are ready to use them, take them out of the freezer and put them directly into a warm oven (either your warm setting or about 200 degrees) once warmed, they will taste freshly baked.
I learned this from a pastry chef! It works.
As far as reheating something from ealier in the morning.. I'm not to sure. I would think a oven would be better???