Gather all ingredients. Preheat the oven to 350 degrees F (175 degrees C). Grease a 9x9 inch baking pan. Allrecipes / Diana Chistruga
Toss walnuts and chocolate chips with 1 teaspoon cocoa powder in a bowl until well coated; set aside. Mix tapioca flour, sorghum flour, teff flour, 1/3 cup cocoa powder, xanthan gum, and salt together in a separate bowl. Allrecipes / Diana Chistruga
Beat butter and sugar together in a separate large bowl until creamy and lighter in color. Stir in eggs and vanilla extract. Allrecipes / Diana Chistruga
Gradually add flour mixture to butter mixture until fully incorporated. Fold in nuts and chocolate chips. Allrecipes / Diana Chistruga
Spread batter into the prepared baking pan. Allrecipes / Diana Chistruga
Bake in the preheated oven until the top is dry and the edges have started to pull away from the sides of the pan, about 25 minutes. Allrecipes / Diana Chistruga
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