Ingredients
Equipment
Method
Make the crust
- Heat the oven to 350°F.
- Grease a 9-inch springform pan.
- Stir together the chocolate cookie crumbs, melted unsalted butter, and kosher salt.
- Press the mixture firmly into the bottom of the pan.
- Bake the crust for 10 minutes.
- Set the crust aside to cool.
Make the filling
- Reduce the oven temperature to 325°F.
- Wrap the outside of the springform pan in two layers of heavy-duty foil.
- Set the wrapped pan in a deep roasting pan.
- Beat the softened cream cheese and granulated sugar in a large bowl until smooth.
- Mix in the sweetened hot cocoa mix and unsweetened cocoa powder.
- Mix in the melted semisweet chocolate, cooled slightly.
- Beat in the room-temperature eggs one at a time on low speed.
- Mix in the room-temperature sour cream and vanilla extract just until combined.
- Pour the filling over the crust.
- Pour boiling water into the roasting pan until it reaches halfway up the sides of the springform pan.
Bake and chill
- Bake for 80 to 100 minutes, until the edges are set and an instant-read thermometer inserted in the center reads 160°F.
- Turn off the oven.
- Prop the oven door open slightly.
- Leave the cheesecake inside for 1 hour.
- Lift the springform pan out of the water bath.
- Remove the foil.
- Cool the cheesecake on a rack for 1 hour.
- Cover and refrigerate for at least 6 hours.
Make the topping
- Whip the cold heavy cream, powdered sugar, and vanilla extract in a chilled bowl until firm peaks form.
- Spread the whipped cream over the chilled cheesecake.
- Top with the mini marshmallows.
Notes
For the smoothest filling, mix just until combined after adding the eggs. Refrigerate covered for up to 5 days; freeze slices wrapped tightly for up to 2 months. For a gluten-free option, use gluten-free chocolate cookie crumbs for the crust.
