Set your oven to 300°F if using a dark non-stick springform pan, or 325°F for a silver one.
In a gallon-sized Ziploc bag, crush 16 Nutter Butter cookies with a rolling pin.
Melt 4 tablespoons of butter and combine it with the crushed cookies.
Press this mixture into the bottom of a 9-inch springform pan and set it aside.
In a mixing bowl, use an electric mixer to beat together the cream cheese, sour cream, and peanut butter until the mixture is completely smooth, scraping the bowl's sides as needed.
Gradually add the sugar and flour, mixing until well incorporated.
Then, add the eggs and beat just until combined.
Spread this filling over the prepared Nutter Butter crust.
Bake the cheesecake for 50 minutes, then let it cool on a wire rack for 2 hours.
After cooling, refrigerate the cheesecake for several hours or overnight.
Once chilled, carefully remove the springform pan's outer rim and cut the cheesecake into 12-16 slices.
Melt the peanut butter chips and heavy cream in the microwave until smooth, then drizzle this mixture over the cheesecake slices.
Optionally, garnish each slice with extra Nutter Butter cookies if desired.