You can purchase these flours or run whole rolled oats, sorghum and millet through the blender to make flour. Make sure it’s very fine. If you don’t have a high-powered blender, purchasing the flour may be your best bet.
Aquafaba is the juice drained off from canned chickpeas. It’s a great egg/egg white replacement. Simply save the liquid next time you open a can of chickpeas and store it in the fridge. Great for use in baked goods, meringues, pancakes, etc.