All-purpose flour is raw and can have harmful bacteria in it like E. coli. Because we aren’t baking the cookie dough, it’s important to heat treat it by zapping it in the microwave or baking it for a few minutes before mixing it into the dough. This kills the bacteria and makes it safe to eat! If you’d rather not heat treat the flour, you can use oat flour made from rolled oats. You can read more about the safety of raw flour and oats here.