Preheat the oven to 350 degrees Fahrenheit. Spray a 9 inch round cake pan with a non-stick baking spray.
In a large mixing bowl, stir together the butter, cake mix and eggs until just combined.
Stir in the chocolate chips.
Press the cookie dough batter into the prepared pan.
Bake for 20-25 minutes or until the edges are just starting to turn slightly golden brown. Be careful not to overcook. It’s better to under cook the cookie dough than over bake it as the cake will continue to cook as it cools.
Let the cake cool completely before adding the frosting.
For the Frosting:
Beat the butter with a hand held mixture until smooth.
Then slowly add in the powdered sugar and cocoa powder.
Add in the vanilla extract and slowly add in the milk until creamy.
Pipe the frosting with a star tip onto the edges of the cookie cake and top with the sprinkles.
Then the cake is ready to slice, serve and enjoy!
Notes
This cake can be made in a 9 inch pie pan as well. Make sure not to over mix the cookie dough or the cookie cake will be tough. Store the leftovers covered at room temperature for up to 4 days.