Gluten Free Cake Mix Sugar Cookies The reviews were really helpful for this recipe! I added an extra egg and completely melted butter. These turned out awesome! I also used parchment paper instead of a greased cookie sheet. Less grease and cookies just move off. I let them sit on top of the oven on the cookie sheet for 1-3 minutes and then removed them. I also did a chocolate version using Betty Crocker's Devil's Food (gluten free) cake mix. I added chocolate chips, two eggs, and completely melted butter. They are so dark and chocolate-y. They do flatten more than the regular sugar cookies so I'll need to tweek the recipe for that but overall a success!