Melt the butter. Combine the melted butter with the cookie crumbs in a mixing bowl. Mix well. Press the mixture into a 9-inch pie plate, smoothing up the side. Bake for 10 minutes. Let cool completely.
Whip the cream until it starts to thicken, and then add the vanilla and brown sugar. Whip until well combined. Chill until needed.
Beat the cream cheese until very smooth, a couple of minutes in a stand mixer (if you don`t get it smooth enough, it will not mix well with the peanut butter and you will have a lumpy pie). Add peanut butter and mix well.
Add a third of the chilled whipped cream mix to the peanut butter and cream cheese mixture. Mix until the peanut butter mixture has loosened up a bit.
Gently fold in the second third of whipped cream and then the final amount.
Scoop the mixture into the cooled pie crust and then freeze for a couple of hours or overnight.
To serve, let the pie sit at room temperature for about 10 minutes to help make it easier to cut. Sprinkle with the chopped peanuts and drizzle each slice with chocolate sauce if desired.
Notes
When making the crust, if the mixture is glossy, add more crumbs. It should be the texture of slightly damp sand.Try graham cracker crumbs instead for the crust.