Make the cheesecake: Preheat the oven to 325°F (160°C). Grease a 10-inch springform pan with nonstick spray.
2. Step
Add the sandwich cookies to a food processor and process into fine crumbs. Pour in the melted butter and pulse several times, until the crumbs are moistened.
3. Step
Pour the cookie crumbs into the prepared springform pan, pressing evenly against the bottom and halfway up the sides.
4. Step
Bake the crust for 10 minutes, until slightly puffed. Remove from the oven, transfer to a wire rack, and let cool completely, about 30 minutes.
5. Step
In a large bowl, beat the cream cheese with an electric hand mixer on high speed until smooth. Add the peanut butter, heavy cream, vanilla, powdered sugar, and salt and beat on medium speed until smooth.
6. Step
Pour the filling over the cooled crust. Transfer the cheesecake to the refrigerator and chill until firm, at least 6 hours, or overnight.
7. Step
Meanwhile, make the peanut brittle: Line a baking sheet with parchment paper.
8. Step
In a medium saucepan fitted with a candy thermometer, combine the granulated sugar, corn syrup, and water. Bring to a boil over medium heat and cook, stirring frequently, until the syrup is golden brown and the temperature reaches 340°F (170°C).
9. Step
Working very quickly, remove the pot from the heat and stir in the butter and baking soda until well combined; the mixture will foam. Stir in the peanuts until well incorporated.
10. Step
Immediately pour the peanut mixture onto the prepared baking sheet and spread evenly with a spatula. Let cool for 15–20 minutes, then break into small pieces.
11. Step
Just before serving, combine the chocolate chips and coconut oil in a small microwave-safe bowl. Microwave for 30-second intervals, stirring between, until completely melted and smooth.
12. Step
Release the springform and transfer the cheesecake to a serving platter or cake stand. Scatter the peanut brittle on top of the cheesecake and drizzle with the melted chocolate.
13. Step
Slice with a warm knife, wiping clean between cuts, and serve.
