For an extra layer of flavor, consider adding a teaspoon of vanilla extract to the marshmallow mixture. If you don't have parchment paper, you can grease the jelly roll pans well with butter and dust with flour to prevent sticking. Feel free to experiment with different types of chocolate chips! Milk chocolate, dark chocolate, or even white chocolate would all be delicious. Store leftovers in an airtight container at room temperature for up to 3 days.