Gather your ingredients:
1 cup sugar
1/2 cup butter
1 teaspoon vanilla
2 eggs
1/3 cup tapioca flour
1/3 cup white rice flour
1/2 cup cocoa
1/2 teaspoon
baking powder
1/2 teaspoon salt
1 teaspoon xanthan gum
Preheat oven to 350 degrees. Grease an 8 X 8 pan with butter.
In small saucepan, melt butter over low heat.
In large mixing bowl, mix the sugar, vanilla and eggs. Stir until well blended.
Sift together cocoa, white rice flour, tapioca flour, baking powder, xanthan gum and salt. Add to the egg mixture. Stir until blended.
Add the melted butter to the brownie batter and mix until well blended. Pour into prepared pan and bake for 25 to 30 minutes.