Make your brownie batter as instructed and preheat oven to temperature.
Place the brownie batter into your muffin tins and top with the mini sandwich cookie, smash down or put the cookie in first if you prefer the cookie on the bottom.
Place the brownies in the oven and bake according to instructions.
Once the brownies are done smash them down with a spoon to make a little "bowl" for the ice cream.
As soon as your brownies are cooled, top with the ice cream and mini chocolate chips.
Freeze until ice cream is frozen and enjoy!