Preheat oven to 350 degrees F/180 degrees C. Grease an 8 x 8-inch square nonstick pan. Stir together flour blend, cocoa, baking powder, salt, and xanthan gum.
In a large mixing bowl, beat the butter and sugars with electric mixer on medium speed until well combined. Add egg, vanilla, and beat until well combined. With mixer on lowest speed, add dry ingredients and warm water. Mix just until blended. Gently stir in chocolate chips and nuts, if desired. Spread batter into prepared pan and bake in preheated oven for 20 minutes or until toothpick inserted in center comes out clean. Cool brownies before cutting. Dust tops with confectioners' sugar (optional) and cut into squares.
Makes 12 brownies.
GLUTEN-FREE FLOUR BLEND
1 1/2 cups sorghum flour or rice flour
1 1/2 cups potato starch or cornstarch
1 cup tapioca flour
1/2 cup corn meal or almond flour (or bean or chestnut flour)
Mix well and use as needed.
Date: October 21, 2006