01 -
Preheat oven to 350°F and grease a 9-inch springform pan.
02 -
Combine crushed chocolate wafer cookies with melted butter in a large bowl. Press mixture onto the bottom and slightly up the sides of the springform pan. Use a measuring cup to help tamp down and shape the crust.
03 -
Melt the chocolate chips in a microwave-safe bowl in 30-second increments, stirring between heating. This should take about 1 minute total.
04 -
In a stand mixer, blend cream cheese and sugar on medium speed until completely smooth. Add milk, eggs, melted chocolate, and sour cream, and mix again on medium speed until well combined.
05 -
Mix in the milk chocolate hazelnut spread and vanilla until incorporated. Then add the cocoa powder and flour, mixing until the flour is just absorbed.
06 -
Carefully pour the filling into the prepared crust using a spatula.
07 -
Bake for 60-75 minutes or until the center is just barely jiggly. Turn off the oven and leave the door slightly open to let the cheesecake cool gradually and prevent cracking.
08 -
Once fully cooled, refrigerate the cheesecake until ready to serve.
09 -
Combine chocolate chips and heavy cream in a microwave-safe bowl. Microwave for 1 minute and let sit for 2 minutes. Whisk until smooth.
10 -
Pour ganache over the whole cheesecake or individual slices. Optionally garnish with chopped hazelnuts, crushed cookies, or chocolate pieces.