These no-bake cookies don't contain (gluten free) flour for safety reasons. Since flour is made from raw, ground grains, it still contains the (potentially harmful) bacteria that were on the grain (called endogenous bacteria). it is not recommended to eat raw flour. As a consequence, raw flour can upset your stomach and make you sick. Obviously, this is not always the case. Most of us have already tried raw cake batter or even eaten raw cookie dough, but it's better to avoid it when possible. This is why gluten free oat flour is the best alternative to flour when making no-bake cookies.