In the bowl of a stand mixer fitted with the paddle attachment, beat the cream cheese and butter until smooth, approximately 3 minutes.
8 oz. cream cheese, 8 tbsp unsalted butter
Mix in the egg and vanilla extract.
1 large egg, 1 tsp pure vanilla extract
Add the cake mix and the salt, and beat on medium until smooth, about 1½ minutes.
15.25 oz. Dark Chocolate Fudge Moist Chocolate Cake Mix*, ¼ tsp kosher salt
Refrigerate the dough for 1-2 hours, or until batter is firm enough to roll into balls.
When ready to bake, preheat oven to 350°F and line a baking sheet with parchment paper. Place the powdered sugar in a shallow bowl.
1 cup powdered sugar**
Roll the chilled dough into tablespoon-sized balls and roll the balls in the powdered sugar. Place the cookies 2" apart on the prepared baking sheet.
Once the oven has fully preheated, bake the cookies for 12 minutes (no longer). The cookies will look and feel a little wobbly and soft.
Place tray on a cooling rack to cool for 2 minutes, and dust the cookies with more powdered sugar (I use a mesh sieve).
Transfer individual cookies to the cooling rack to completely cool.
Dust with more powdered sugar, if desired.