For the crust

1. Line a 9-inch (23cm) springform pan with parchment paper in the bottom and grease the sides.
2. In a small bowl, combine the Oreo cookie crumbs and melted butter and mix well. Press the mixture into the bottom and up the sides of the springform pan. Set in the fridge to chill.

To make the filling

1. In a large mixer bowl, add the cream cheese and sugar and mix until it’s well combined and smooth.
2. Add the peanut butter and vanilla extract and mix until well combined and smooth.
3. Add the sour cream and mix until well combined and smooth.
4. Gently stir in the chopped Reese’s. Set mixture aside.
5. Add the heavy whipping cream and powdered sugar to another mixing bowl and whip on high speed with the whisk attachment until stiff peaks form.
6. Gently fold about half of the whipped cream into the cream cheese mixture until mostly combined, then add the remainder of the whipped cream. Gently fold together until completely combined.
7. Add the filling to the crust and spread into an even layer.
8. Refrigerate cheesecake until firm, 5-6 hours or overnight, the remove from the springform pan and place on serving plate.

For the chocolate ganache topping

1. Put the chocolate chips in a heat proof bowl.
2. Microwave the heavy whipping cream until it just begins to boil, then pour it over the chocolate chips. Allow it to sit for 2-3 minutes, then whisk until smooth.
3. Pour the ganache onto the cheesecake and spread into an even layer. Top with the additional chopped Reese’s.
4. Allow topping to cool and firm up. Refrigerate cheesecake until ready to serve. Cheesecake is best if eaten within 3-4 days.