I doubled this recipe for a 13x9 pan because I have roommates who love homemade treats. Unfortunately, non of us were that impressed with these bars. I realized (while my hands were in the bowl, mixing) that the ratio of butter to dry ingredients wasn't correct at all. I should have cut the amount of butter nearly in half to come out with that crumbly texture necessary for a crisp or bars. Even after adding more flour and oatmeal, the texture still was not quite right-- soft and chewy when expected more of a crunch, at least from the top layer. All in all, the recipe is a decent starting point, but be prepared to make some adjustments yourself!