Stir together the cookie crumbs and melted butter until everything looks like wet sand. Press firmly into the bottom (and just slightly up the sides) of an 8–9 inch springform pan to make the crust. Set aside.
In a large bowl, use an electric mixer to beat the cream cheese, sugar, hot chocolate mix, and peppermint extract until light and fluffy.
Pour in the heavy cream and whip it right into the cream cheese mixture until smooth and creamy.
Spread the filling evenly over the crust, smoothing out the top. Refrigerate for at least 6 hours, or pop it in the freezer for 4 hours if you’re short on time.
For the topping, whip the heavy cream, powdered sugar, and a splash of peppermint together until soft, fluffy peaks form.
Pile the whipped cream over the chilled cheesecake, then sprinkle with mini marshmallows, crushed peppermints, and chocolate shavings.
Slice, serve, and watch everyone’s eyes light up!