For the crust
36 chocolate wafer cookies (8 oz), broken into pieces, or 1 3/4 cups chocolate wafer crumbs
6 Tablespoons unsalted butter
3 Tablespoons dark brown sugar
Pinch of salt

For the filling
6 ounces cream cheese (brought to room temperature)
3/4 cup confectioners sugar
1 teaspoon salt
1 1/4 cup creamy peanut butter
1 teaspoon vanilla extract
2 cups heavy cream

For the garnish
1 ounce semi-sweet chocolate (preferably 55% cacao or greater)
2 Tablespoons creamy peanut butter