Easy to put together. The topping is what makes this cookie so great. Now that I've looked back at this recipe, I see that I only used 1/2 C. butter rather than the 1 C. butter that is specified. Maybe that's why I thought the shortbread part of it wasn't all that special. My mistake. I also question what '1 (1 - 2 cup) cup butter' means in the ingredient list means. Seems like a lot of leeway if that means you can use between 1 and 2 cups of butter.