In my experiments with gluten-free baking, I quickly discovered that all GF flours and flour blends are not the same. I also realized if I wanted to control the quality and outcome of the finished item, I would have to mix the flour blend myself. Thankfully, I found this recipe. It’s flawless, and it has never yielded a bad result for me. From the America’s Test Kitchen website: “When looking for a wheat-free substitute for all-purpose flour, no single gluten-free flour or starch behaves like wheat flour—a blend is a must. Because store-bought blends perform inconsistently—one product might deliver great cookies but sub-par cakes—we decided to create our own. We found that two flours—white rice and brown rice—provided the right baseline of protein, starch, and flavor.
Since different starches absorb water, swell, and gel at different temperatures and to different degrees, we enlisted both tapioca starch and potato starch to create the right amount of chew and structure. Milk powder was key to our blend’s success, contributing proteins that help improve structure in our gluten-free baked goods and, along with its sugars, undergo the Maillard browning reaction, which leads to more complex flavor.”
More from ATK: “Be sure to use potato starch, not potato flour, with this recipe. Tapioca starch is also sold as tapioca flour; they are interchangeable. We strongly recommend that you use Bob’s Red Mill white and brown rice flours. We also recommend that you weigh your ingredients; if you measure by volume, spoon each ingredient into the measuring cup (do not pack or tap) and scrape off the excess.”