Sprinkle gelatin over 1/2 cup of cold water and let it sit for 5-10 minutes to bloom.
In a saucepan, combine maple syrup (or cane sugar) and 1/2 cup water. Heat over medium, stirring until dissolved and the mixture is bubbling. Remove from heat once it’s fully dissolved.
Slowly pour the hot syrup into the bloomed gelatin while mixing on low speed. Increase speed and whip for 8-10 minutes, until soft peaks form and the mixture becomes fluffy.
Pour the marshmallow mixture into a greased or parchment-lined 8x8 pan. Let it set for 4-6 hours or overnight. Once firm, dust with arrowroot powder and powdered sugar. Cut into desired size.