01 - Line the bottom and sides of a 9-inch springform pan with parchment paper or plastic wrap for easy removal.
02 - Combine crushed cookies and melted butter in a medium bowl. Mix until evenly moistened, then press firmly into the bottom of the prepared pan to form an even layer. Freeze for 15 minutes.
03 - Remove mint chocolate chip ice cream from the freezer and let soften at room temperature for about 10 minutes until spreadable.
04 - Spoon the softened ice cream onto the chilled crust. Smooth the top with a spatula. Freeze for at least 4 hours, or until firm.
05 - Place chocolate chips and butter in a heatproof bowl. Heat heavy cream in a small saucepan until just simmering, then pour over the chocolate. Let sit for 2 minutes, then whisk until smooth and glossy. Cool to room temperature.
06 - Pour the cooled ganache over the frozen ice cream layer, spreading evenly. Freeze for at least 2 hours, or until set.
07 - Before serving, decorate with mini chocolate chips and fresh mint leaves if desired. Let sit at room temperature for 10 minutes, then slice with a knife dipped in hot water.