If you do have any of your healthy zucchini fritters leftover, cool them completely to room temperature before placing them in an airtight container and refrigerate. It's important to cool them before sealing them in a container so condensation doesn't form in the container, which will make them soggy! They can be reheated in a 450 degree oven for 5-7 minutes, or can be pan fried in a small amount of oil for a few minutes on each side - just long enough to reheat. Technically you could heat them in the microwave, but they'll be soggy, and not crispy at all. I don't recommend this method.