chocolate-peanut butter cheesecake with pretzel crust

2 ½ cups crushed pretzels
½ cup + 2 TB butter, melted
4 (8 oz) blocks cream cheese, softened
½ cup sour cream
¼ -1/2 cup peanut butter (chunky or smooth)
1 cup granulated sugar
generous pinch of salt
3 large eggs
2 large egg yolks
2 TB flour 
¼ cup heavy whipping cream

for the chocolate swirl:
 ¼ cup ( +/- )  chocolate-peanut butter from The Peanut Butter Co.

cook notes:
Use small pretzels, they are easier to crush up in the food processor.  
DO NOT use pretzel thins, they are not good at forming a crust, trust me I tried!
I have never baked my cheesecakes with a water bath, if this is what you prefer then please go right ahead.  
I always bake my cheesecakes with low temps—low and slow. And of course you can use any type of chocolate swirls you wish, 
I just loved using the chocolate-peanut butter from Peanut Butter Company because it’s so convenient & easy, 
plus is does NOT dissolve or bleed than say regular melted chocolate would. 

Preheat oven to 350F. Grease a 9 or 10­inch springform pan on bottom/sides. 
Set aside.
Mix crushed pretzels with melted butter. Press firmly and evenly into prepared springform pan. 
Bake crust for 8-10 minutes or until its set.
Turn oven down to 300F.  (if you want a water bath then place large pan of water on lowest rack).
In bowl of stand mixer, combine softened cream cheese, sour cream and sugar. Mix until smooth and creamy. 
Add eggs, egg yolks, and peanut butter. Mix until smooth, then add in the heavy cream, mix once more, then add in the flour. 
Final mix until all is nice and incorporated.
Pour batter into prepared pan. 
For the chocolate swirls, take a few tablespoons of the chocolate peanut butter, place as gobs on top of cheesecake, 
then take a chopstick or something similar and make swirls in the batter.  Do not push swirls down! Put as many swirls as you wish. 
Place springform pan on large baking sheet lined with parchment paper.
Bake in center rack, until filling seems mostly set, about 40-50 minutes. 
It’s ok if there is a bit of jiggle in the center, it will set up once it’s chilled. 
You know the cheesecake is done with the edges are all set up and the center is not gooey. 
I turn off the oven, leave the oven door open, and let it come to room temp for about an hour or 2. 
Then place the cheesecake in fridge for a few hours or overnight to let it truly set up. 
 You can try to slice it, but it might be a bit gooey, but hey that could be your thing!
When ready to serve, if you see the edges are sticking to the sides you can either use a very thin knife that is slightly wet and 
run it around the edges or place in freezer for a few minutes to shrink and release.  
With a little prayer and luck release the springform latch, slice and serve with fresh whipped cream and/or melted chocolate.