Preheat oven to 350 degrees, and line two baking sheets with silicone mats or parchment paper.
In a large mixing bowl, (or the bowl of an electric mixer), beat cream cheese until smooth.
Add in room temperature butter, and beat until fully incorporated, scraping down the sides of the bowl as needed.
Add egg and beat until fully incorporated.
With mixer on a low speed, add in cake mix and flour and beat until just combined. Scrape down sides as you go to ensure even incorporation.
Add in 6 crushed candy canes, and 2/3 cup of the marshmallows, and mix until just combined.
Using a medium size cookie scoop, scoop out 10 cookies per baking sheet leaving a few inches of space in between.
Use the remaining crushed candy canes and marshmallows for garnish by pressing them on top of the cookies.
Allow dough balls to chill on their trays in the fridge for 30 minutes before baking.
Bake 15 minutes, or until the edges of the cookies are just set.
Immediately after removing from the oven, the cookies will probably be wonky shaped. If you want them to be in perfect circles, take an upside down bowl or cup (or cookie cutter) that is larger than the cookie, place it over the cookie so it’s touching the tray, and swirl it around the cookie to scoot it back into shape.
When trays are cool enough to handle, transfer to fridge to finish chilling. Serve cold. Enjoy!