If warming in the oven, you can heat the oven to 425 degrees and warm the parmesan bread bites on a baking sheet for 5-10 minutes or until warmed through.
If in a rush, these bread bites also heat well in a microwave oven for 30 seconds or so. You don’t want to overheat them when reheating, since they can harden and otherwise lose their soft, fluffy texture.