In medium bowl whisk together flour blend, baking soda, xanthan gum and salt. Set aside.
In a large bowl mix melted butter and both sugars until combined.
Add egg, milk and vanilla stirring until smooth.
Using a stand mixer add flour to butter/sugar and mix until soft.
Add chocolate chips, mix until evenly combined.
Cover cookie dough and let rest for 30 minutes. Or make dough balls using a portion scoop. Cookie dough balls can be frozen at this point.
Preheat oven to 350°F.
Place cookies on baking sheet at least 2 inches apart. Bake for 11-13 minutes until golden brown and the edges are set.
Place baking pan on a wire rack for 2-3 minutes then transfer cookies to the wire rack and cool completely.
Store in air tight container for maximum freshness.
Notes
*EGFG gluten free flour blend: 300g sweet rice flour, 300g potato starch, 200g sorghum flour, 200g millet flour (makes ~8 cups)Resting Time: Some cookie recipes include a resting time which helps the gluten free flours and starches absorb the fat and liquid more fully. This is a guide and will vary depending on the specific flour blend you use. Frozen dough balls: Bake cookies right from frozen exactly as directed.