INGREDIENTS
1
Egg, large
1 tsp
Baking powder
1 tsp
Baking soda
1/2 cup
Brown rice flour
1/2 cup
Cornstarch
3/4 cup
Dutch-processed cocoa, powder
1 1/4 cups
Granulated sugar
1/4 tsp
Salt
1/2 cup
Tapioca starch
1 tsp
Xanthan gum
3/4 cup
Butter, unsalted
1 tbsp
Rum or 1 tsp rum extract