01 - Line the bottom and sides of a 9-inch springform pan with parchment paper or plastic wrap to ensure easy removal later.
02 - Combine crushed cookies and melted butter in a medium bowl, mixing until evenly moistened. Press firmly into the bottom of the prepared pan to form an even crust. Freeze for 15 minutes.
03 - Remove ice cream from the freezer and let it soften at room temperature for about 10 minutes until spreadable consistency is achieved.
04 - Spoon the softened mint chocolate chip ice cream onto the chilled crust. Smooth the top with a spatula and freeze for at least 4 hours or until completely 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 mixture. 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 again for at least 2 hours or until completely set.
07 - Decorate the cake with mini chocolate chips and fresh mint leaves if desired. Let the cake sit at room temperature for 10 minutes before slicing with a knife dipped in hot water for clean cuts.