Preheat the oven to 350 degrees. Line the baking sheet with parchment paper or a silpat pad, set aside.
Place the cake mix in a medium-size mixing bowl. Add the melted butter and lightly stir. Add the egg. Using a hand mixer, mix until the cookie batter is combined.
Mix the sugar and cinnamon together.
Roll cookie dough into 1" balls. Then coat them in the cinnamon sugar mixture. (I run it through the mixture twice to ensure each cookie is well coated.)
Place on the lined cookie sheet. Bake in the preheated oven for 10-12 minutes until puffy and golden brown.
Remove from the baking sheet and allow to cool on a cooling rack. Store in an airtight container on the counter 5-7 days. Enjoy!
Notes
Depending on the size of your cookie scoop, this will make 20-24 soft chewy cookies. Storage - Store cookies in an airtight container at room temperature for 5-7 days. One of my favorite things about this recipe is that these cookies freeze well. Pop them in a freezer bag and store them in the freezer for up to 3 months. Thaw on the counter for a couple of hours.