Preheat the oven to 325°F (165°C). Lightly grease an 8- or 9-inch springform pan with cooking spray.
Prepare the crust: Crush the Nutter Butter cookies into fine crumbs using a food processor or sealed bag with a rolling pin.
Crush the Heath bars into small pieces and mix them with the cookie crumbs, melted butter, and salt.
Press the mixture firmly into the bottom of the pan and about one-third up the sides.
Make the filling: Beat the cream cheese until smooth. Add peanut butter and sugar, mixing until creamy.
Add eggs one at a time, mixing just until combined. Blend in sour cream, vanilla, and salt.
Pour the filling over the crust. Wrap the pan bottom in foil and place it in a larger roasting pan. Add hot water halfway up the sides.
Bake for 1 hour 30 minutes, until the center slightly jiggles.
Sour cream layer: Mix sour cream, sugar, and vanilla. Spread evenly over the cheesecake and bake for 10 more minutes.
Turn off the oven, crack the door, and let the cheesecake cool inside for 1 hour. Chill for at least 5 hours or overnight.
Mix peanut butter and heavy cream until smooth. Pipe over the chilled cheesecake and garnish with cookies and toffee pieces.