For an extra layer of flavor, consider adding a handful of chopped walnuts or pecans to the batter. Store leftover pumpkin bread in an airtight container at room temperature for up to 3 days, or in the refrigerator for up to a week. Feel free to experiment with different types of marshmallows, such as flavored or jumbo-sized marshmallows. To prevent the marshmallows from burning, keep a close eye on them while broiling and adjust the rack position as needed.