Line the bottom of a spring form pan with non-stick foil, then spray the sides with non-stick cooking spray.
Prepare brownies as directed on package and bake in spring form pan.
When brownies are first removed from the oven, slide a cookie down inside of the brownie to line the outer edge of the pan. Place in fridge to chill.
Spread some of your hot fudge over the top of the brownie. Warm the rest of the jar in the microwave to use as drizzle.
Slightly soften ice cream, scoop into the middle of the cookies on top of the brownie and hot fudge. (you can smooth it out of you desire, but I like the lumpy look with the cookie crumbles!)
Drizzle with a small amount of hot fudge.
Crumble the remainder of the cookies over the top and drizzle with more hot fudge.