If you get discouraged with any of these worthy experiments — as I did with the Hamlyn Oats attempt below; notice the oatmeal collected at the bottom! — you can always try a new-fangled Oatmeal Cookie Drink. Layer 1 oz. Grand Marnier, 1 oz. butterscotch schnapps, and 1 oz. Irish Cream. However, you are probably better off just eating the cookie.