Preparation

• In an extra-large bowl or container, combine the rice flours, tapioca flour, and potato starch. Whisk together until the ingredients are thoroughly blended. Use a large spoon to bring the flour from the bottom of the bowl up to the top and whisk again. Repeat a few times to make sure the flours are evenly distributed throughout the entire mixture.
• Store the flour in an airtight container or zip-top storage bag at room temperature for up to 1 month. For longer storage, keep the flour in the refrigerator or freezer. Allow the flour to come up to room temperature before using.
• Lightly stir the flour before measuring. Spoon the flour into the measuring cup and level off the top with a straight-edged utensil, such as the back of a knife.