This is an easy recipe for super crispy cookies using pancake mix. Cream together room-temperature butter, granulated sugar, and egg yolk in several batches, then add the pancake mix and bring the dough together. After letting the dough rest in the refrigerator, roll it out thinly, cut out shapes with cookie cutters, and bake in the oven. The key is to carefully mix the butter, sugar, and egg yolk separately, and to roll out the dough while it is chilled in the refrigerator. This will result in cookies that are easy to handle and bake evenly. This is an easy recipe that even beginners can try, and it's perfect for a snack or as a gift.