Cup4Cup Gluten Free Pie Crust Mix Lets You Create Deliciously Flaky Pie Crusts Without Worrying About Gluten. A Combination Of Cornstarch, White And Brown Rice Flours, And Tapioca Flour, Our Mix Delivers The Same Texture And Taste You'D Expect From Pie Crusts Made With Traditional Flour - Just Add Butter, Eggs And Water. This 1 Lb. Mix Yields One Double-Crust Or Two Single-Crust Pies.