While sharing the slickest kitchen tricks, J. Kenji López-Alt wrote for Serious Eats that “The hot plate under the coffee pot gets hot enough to heat and crisp up a half a bagel.” It sounds like a potential disaster, but the coffee maker’s warmer (or burner) keeps the coffee carafe hot by maintaining a consistent temperature. These conditions are suitable for toasting bagels, but only if they’re store-bought, going stale, or destined for sandwiches, (per Insider).
NPR successfully toasted a slice of white bread on a coffee burner in its “artisanal toast” experiments. The outlet notes that you should incorporate a slight weight to sit the bread on the burner, as long as it’s not so heavy that it smushes the bread, but expect the top of your toast to be a little concave. Furthermore, the process takes about 20 minutes, so only attempt this if you have the bread (and time) to spare. Lastly, NPR warns that the bread may stick to the burner, so be ready for some cleaning afterward. The Stanford Daily suggests using aluminum foil on the burner, which can catch potential messes.