I make my own GF Mix - made up huge batches and poured into 5 gal bucket with gamma lid to store so nothing can get into it - but gamma lid makes it easy to open up and fill your canister that you use day to day. 1 c oat flour, 1/2 cup corn starch, 3/4 c coconut flour, 3/4cup sweet rice flour, and one pound of Betty Crocker's rice flour blend. Use 1:1 for flour in recipes upping the amount of baking powder listed in the recipe and the appropriate amount of xanthan gum based on whether you are making cake, cookies, bread, etc.