GLUTEN-FREE: I have tested both Pamela's Chocolate Cake Mix and King Arthur's Flour Chocolate Cake Mix successfully. Note that gluten-free baking mixes tend to yield fudgier, more brownie-like cookies than their gluten full counterparts. They also make close to three dozen cookies.
DAIRY-FREE: Use a dairy-free milk option; I usually have my
homemade almond milk or cashew milk on hand.
I have found that your typical Betty Crocker or Dunkin Hines (i.e., gluten-full) cake mixes need only 2 tablespoons of milk. However, gluten-free cake mixes generally need a bit more liquid, and are initially very crumbly with only 2 tablespoons of milk. Add additional milk to the dough, 1-2 tablespoons at a time, until a dough forms; I've found that nearly ¼ cup of milk is usually the magic number.
If the dough is too sticky to handle, toss it in the refrigerator for 5-10 minutes before rolling out into balls.
If you don't love the combination of chocolate and peppermint, you can substitute white chocolate chips (or more dark chocolate chips) in this recipe instead.