Sort of! They won't roast over an open flame like store bought marshmallows made with corn syrup and additives but they do broil in the oven. If you want to try to do so, you are going to want to leave them to dry out at for a significantly longer period of time. Cut them into squares after the minimum 6 hours and then leave them out on a piece of parchment paper in a dry area at room temperature, for a full day. This allows them to firm up some more as the gelatin sets more, to withstand the heat. I have successfully broiled them after drying out for 24 hours, by using my oven's broiler function for 30-45 seconds.