The metal pans heat up the bread by conduction, i.e., the coils heat up the pan which then heats up the bread instead of directly like the glass pan.
(the coils; heat up; i.e., the coils heat up the pan which then heats up the bread instead of directly like the glass pan)
the coils
heat up
i.e., the coils heat up the pan which then heats up the bread instead of directly like the glass pan