Place the brownie mix in a microwave-safe bowl.
Microwave the brownie mix on high for 90 seconds, stirring every 30 seconds.
Allow the heat-treated brownie mix to cool slightly before adding it to the dip mixture.
In a large mixing bowl, combine the softened cream cheese, thawed whipped topping, and milk.
Mix until the mixture is smooth and fully combined.
Add the cooled, heat-treated brownie mix to the cream cheese mixture.
Fold the brownie mix into the mixture until a smooth dip consistency forms.
Add the mini chocolate chips.
Fold gently until the chocolate chips are evenly distributed throughout the dip.
Transfer the Brownie Batter Dip to a serving bowl.
Sprinkle additional mini chocolate chips over the top.
Serve immediately with desired dippers, or refrigerate until ready to serve.
If refrigerated before serving, allow the dip to sit at room temperature for several minutes to soften slightly before serving.