One of my favorite things to do is bake. I love getting into the kitchen, getting out bowls and measuring spoons, opening the pantry door and standing before the sugars, flours, and baking ingredients.
Gently sift cornstarch, sorghum flour, tapioca flour, xanthan gum, baking powder and salt in medium bowl. Set aside.
Microwave butter in large microwavable bowl on HIGH 1-2 minutes or until melted. Pour into cocoa mixture and stir until well blended.
Gradually stir in flour mixture until well blended. Spread in fparchment-lined 13x9-inch baking pan sprayed with no stick cooking spray.
Bake 30 to 35 minutes or until toothpick inserted in center comes out clean. Cool in pan on wire rack. Cut into bars.