if using protein marshmallows warm the marshmallows for just a few seconds, let cool 30-60 seconds, place in piping bag and pipe onto center of cookies right away *my protein marshmallows are on my Instagram page and Foodsocial page too if you search "protein marshmallows" ** I used my favorite high quality protein from just ingredients brand. No fillers or junk, only nourishing ingredients. Code colleenf10 saves you $ sitewide at justingredients.us