Combine powdered sugar and tapioca flour in a small bowl. Coat an 8x8 pan with the mixture, tapping off excess. In a stand mixer bowl, mix pea protein, baking powder, and xanthan gum. Add cold water and whisk for 10 minutes until stiff peaks form.
These vegan marshmallows are delicious just after they’re made, but unfortunately they do not keep well. Make this recipe and enjoy it on the same day.