In a large bowl, use an electric mixer to beat the butter and cream cheese until fluffy. Beat in egg and cake mix.
Scoop cookie dough, with a 1 tablespoon cookie scoop, onto a parchment or silpat lined baking sheet. Chill sheet with scooped cookie dough for 30 minutes.
Preheat oven to 350 degrees.
Bake the cookie for 10-12 minutes at 350°F until just cooked through. We want them to come out super soft. Transfer to wire rack about 5 minutes after removing from oven, to cool completely.
FROSTING
In a medium sized prep bowl, beat together cream cheese and butter until smooth. Whisk in the milk and powdered sugar.
Spread frosting liberally over cooled cookies.
Notes
Calories are automatically generated. For best results calculate based on your exact ingredients.