O'Fallon Brewery Knotty is an Oatmeal Stout by style. Dad's Scotch Oatmeal cookies are a St. Louis tradition. We have taken the key ingredients in Dad's Scotch Oatmeal cookies and incorporated them into an Oatmeal Cream Stout. This stout is velvety smooth with a creamy mouthfeel. Hints of chocolate, cinnamon, caramel, oat, raisin, and vanilla combine to create this liquid cookie.. This craft beer is 5.9% ABV and 14 IBUs. In this craft beer review, we will take a look at the color, smell, and taste.