Chocolate Peanut Butter Cheesecake

This is a Nigella recipe from my friend S (yes, that S, of the famed 'The London Diaries'! Check it out under my Favorites tab). It's a British recipe, so I've done my best to translate everything over into American cooking terms and ingredients. However, I will also include the link to the original recipe, for my readers in the U.K.!
Also, I'm including a video that S sent me of Nigella making this cheesecake. If you've never seen Nigella Lawson in action, you're missing out! She has a way of making everything she cooks seem sensual and sexy. To quote S, it's almost like "food porn"! Not to mention, she cooks in a robe. So, there's that!
Anyways, without further ado...

Here's the link to the original recipe
http://www.nigella.com/recipes/view/CHOCOLATE-PEANUT-BUTTER-CHEESECAKE-5309

Here's the Americanized version of the recipe

Base
2 1/4 cups graham cracker crumbs
1/3 cup salted peanuts
1/2 cup dark chocolate chips
3 1/2 tbsp softened unsalted butter

Preheat oven to 300
Process the base ingredients in a food processor or blender
When it comes together in a clump, put it into a springform pan and press along the bottom and sides to form a crunchy crust
Place into fridge while you make the filling

Filling
2 cups cream cheese
3 eggs PLUS 3 egg yolks
1 cup ultra fine sugar (If you can't find ultra fine sugar at the grocery store, you can take regular sugar and process or blend until fine)
1/2 cup sour cream
1 1/2 cups creamy peanut butter

Place filling ingredients into a processor or blender and mix until smooth
Pour filling on top of the base in the springform pan
Bake for one hour. The top should feel set and dry. If not, bake a little longer.
Set aside while you make topping

Topping
1 cup sour cream
1/2 cup milk chocolate chips
2 1/2 tbsp soft brown sugar

Warm topping ingredients in a small saucepan, over low heat, whisking to blend in chocolate as it melts.
Remove from heat
Spread topping gently over the cheesecake, trying not to break the surface of the cheesecake, or it will marble
Bake for 10 minutes
Remove from oven, allow to cool, then refrigerate overnight, before serving

And finally! Here's the link to the video
http://www.youtube.com/watch?v=mlyFkauPQKI