Want to use oat flour in a recipe, but don't have any on hand. We've got you covered! It's so simple to make and a great way to add whole grains to recipes! How To Make Oat Flour: Placing rolled or quick oats in a blender and blending them for about 15-20 seconds, just until a powder is formed. Oat flour can be substituted with other flours such as brown rice, buckwheat, sorghum, and millet flour. We recommend replacing the oat flour weight for weight with any of these flours when baking (not cu