Pour 1 half cup of water into a stand mixer bowl or large mixing bowl.
Evenly sprinkle the gelatin over the water. Let it bloom undisturbed for several minutes.
In a saucepan, combine the remaining water with the honey or maple syrup. Bring to a gentle boil, then reduce to a simmer for about 5 minutes.
Turn the mixer on low speed and slowly pour the hot sweetener mixture into the bloomed gelatin.
Add the vanilla extract.
Increase the mixer speed to high and whip for 8 to 10 minutes until thick, glossy, and white. The mixture should barely drip from the beaters.
Quickly transfer the marshmallow fluff into a parchment lined dish.
Allow to set at room temperature overnight before slicing.
Lightly dust with arrowroot powder if desired.
Healthy Homemade Marshmallows may feel like a novelty the first time you make them. After that, they become one of those recipes you return to without overthinking it.