Preheat oven to 350°F. Pour cake batter mix onto cookie sheet or into a baking dish and spread it into a thin layer. Bake for 5 minutes to pasteurize cake mix.
In a medium bowl, whisk milk and sugar until sugar is dissolved. Stir in heavy cream and vanilla.
Add cake batter mix and whisk until there are no lumps. It is best if you have let the cake batter cool a bit before adding to the mixture.
Pour into your ice cream maker and allow it to churn until it reaches your desired level of thickness. The ice cream maker that I use usually takes about 25-30 minutes. At this point, the ice cream is approaching a soft serve consistency.
Add remaining ingredients in the last 5 minutes and continue to churn to mix in.
Pour ice cream into a separate container to freeze. I personally use a metal bread pan and it fits this ice cream in it perfectly!
If you wish to make the ice cream look pretty, sprinkle the top of the ice cream with extra cookie dough, Reese's, graham cracker pie crust, and chocolate shavings.