This is the recipe I use to make them: https://redheadedherbalist.com/marshmallow-root-marshmallows/
You can use pretty much any herbal tea in the place of the mallow root to make different flavors. I usually dust mine with coconut powder instead of arrowroot, too. Mallow powder can be found at most health food stores, but you can also forage your own Mallows or cheese weed to make your own if you know what to look for.
I'd hit it since I'm already there