All you need to do is add about a cup of peanut butter chips and a cup of Reese's Pieces candy to the dough. Then you press it into a 9x13-inch pan and bake at 350 degrees until it's just starting to brown on top. Maybe 20 minutes?
When the pan comes out, press in a few candy eyeballs (which you can find at craft stores like JoAnn and Michaels). Let the pan cool, then cut the cookies into rectangles. They are SO GOOD, especially when they are still a little warm.