Prepare a springform pan by lining the sides with parchment paper, letting it extend above the edges.

Make brownie dough according to package instructions and bake in two 8-inch pans. Allow to cool.

Combine milk, cream cheese, sugar, and peanut butter until smooth. Fold in thawed Cool Whip.

Layer the brownie in the prepared pan, spread caramel and chocolate sauces, top with chopped Snickers, and spread part of the ice cream mixture.

Repeat layers with remaining brownie, sauces, Snickers, and ice cream mixture. Freeze until firm.

Remove from freezer, top with additional sauces and chopped Snickers. Let sit at room temperature before slicing.