Preheat the oven to 350 degrees Fahrenheit. Prepare a baking pan with parchment paper.
Crush the Oreos in a food processor or place in a plastic bag and beat with a rolling pin until they are fine crumbs.
In a medium sized bowl, add crushed Oreos and melted butter. Use a fork to blend together until a crumbly mixture forms.
Pour Oreo mixture into the prepared baking dish. Press into the bottom to create an even layer of crust.
Bake in oven for 10 minutes. Remove and let cool on wire rack.
In a large mixing bowl, blend the cream cheese with a hand mixer until smooth. Add the peanut butter and blend again until combined.
Add the sugar, salt and flour. Mix until combined.
Add each egg to the mixture one at a time, mixing in between each addition. With the addition of the last egg, also add the vanilla extract and sour cream. Mix until smooth.
Fold in the peanut butter cup pieces, spreading evenly throughout the cheesecake filling.
Pour the cheesecake filling into the baking pan on top of the cooled Oreo crust.
Bake for 55-60 minutes or until the edges of the cheesecake are set and the center is still a bit jiggly. Then turn off the oven and open the oven door. Let it sit in the oven and finish baking for another hour.
Once the cheesecake is done, let chill in the fridge for at least 2 hours.
When ready to serve, make the ganache.
In a heat safe bowl add the chocolate and salt. In a small saucepan, heat the heavy cream over medium heat until steaming, but not boiling.
Pour the hot heavy cream over the chocolate and let sit for 3 minutes before stirring.
Whisk together until a smooth ganache is formed. Add the vanilla extract and mix again until combined.
Pour the ganache evenly over the cheesecake bars, spreading with a rubber spatula, offset knife, or spoon if necessary.
Cut the peanut butter bars.
To top each individual piece, melt some peanut butter and drizzle on top. Add a few pieces of peanut butter cup to finish.
Notes
Can bake ahead and refrigerate until ready to top with ganache and serve.
Refrigerate and store cookies in an airtight container.