"I modified an old family favorite recipe upon going gluten-free. It is easy and super yummy and naughty. If you prefer to use a premade GF flour mix instead of the flours suggested it will work just as well."
Preheat oven to 350º. Toss nuts and chocolate chips with a teaspoon of cocoa powder until coated. Set aside. Combine flours, cocoa, xanthan gum, and salt. In a separate bowl mix butter and sugar until incorporated. Mix in eggs and vanilla. Add dry mixture gradually until incorporated. Fold in nuts and chocolate chips. Spread in a greased 9x9 pan and bake approx. 25 minutes or until set.