In a large bowl beat together butter and egg. Add the cake mix and your add-in ingredient of choice and gently mix until dough is formed.
Line a large plate with parchment paper (you can also use a large tray or platter).
Form 1/4 cup sized balls of dough, place on the plate and flatten about halfway down with your palms. Dot the tops with more of your add-in ingredient.
Cut away the excess parchment paper if there is any. Cover with plastic wrap and refrigerate for at least 2 hours.
Preheat oven to 350°F. Line a baking sheet with parchment paper or a non-stick baking mat.
Place the dough balls on the baking sheet 2 inches apart and 2 inches away from the edge (no more than 6 cookies per baking sheet).
* Cookies are done when the edges are light brown and firm and the center is puffy, pale, and slightly under baked.
Allow cookies to cool and set on the baking sheet for 20 minutes then remove. Store immediately after cookies are fully cooled.
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