Once the Utica Greens have cooled to room temperature, place them in a sealed container in the refrigerator. They should be consumed within 3–4 days of being freshly made. The sooner you eat them, the better they'll taste, as the flavors continue to meld together even after cooking. To reheat, put them in the microwave and sprinkle a few drops of water over the greens to keep them moist. Cover them loosely, then reheat until warm. You can also use an oven; simply reheat at 350°F until they're heated through. You may want to add a fresh sprinkle of breadcrumbs to revive the crunchiness of the topping before serving.