"These are a gluten-free version of the Toll House® cookie recipe. My daughter was on a gluten-free diet for 3 years and in that time I converted many recipes. You can not tell the difference between these cookies and normal cookies."
Combine white rice flour, teff flour, cornstarch, sweet rice flour, baking soda, xanthan gum, and salt in a bowl.
Beat butter, white sugar, brown sugar, and vanilla extract together in a bowl until smooth and creamy. Add eggs, 1 at a time, beating well after each addition. Slowly beat flour mixture into creamed butter mixture until dough is just mixed; fold in chocolate chips and walnuts. Drop dough by round spoonful onto the baking sheet.
Bake in the preheated oven until cookies are golden brown, 9 to 11 minutes. Let stand for 2 to 3 minutes on the baking sheet before transferring to a wire rack to cool completely.