Death by Chocolate Mousse

Preheat the oven to 350 degrees F (175 degrees C). Generously grease a 9-inch springform pan with 2 3/4-inch sides.

Make crust: Mix together crushed cookies and butter in a medium bowl until well combined. Press mixture evenly into the prepared pan.

Bake in the preheated oven for 5 minutes. Set aside to cool.