• 1/2 cup (100 grams) butter or margarine
• 2 cups brown sugar
• 3 eggs
• 1 teaspoon vanilla
• 2 teaspoons baking powder
• 1/2 teaspoon salt
• 3/4 teaspoon guar gum or xanthan gum (optional)
• 1/3 cup cocoa
• 1 1/2 cups gluten-free flour
• 1 cup chopped nuts (optional)

Blend together with mixer. Spread in a 9×13 inch pan (23 x 33cm) pan.  Bake at 350F (175C) for 30-35 minutes. (I love these and I don’t even need a gluten-free diet!)