I make up this mix and keep a large canister of it in my refrigerator at all times. I use it in place of all-purpose flour. This is linked to my favorite gluten-free author, Bette Hagman. I've used her basic flour and baking mix recipes for years. I also find that adding about a teaspoon of vinegar to the wet ingredients gives it more "rising" power and keeps the final product from being so "heavy."
Recipe by DealsFromMsDo.com at https://dealsfrommsdo.com/gluten-free-substitute-for-all-purpose-flour/