Preheat your oven to 375°F (190°C).
Mix the chocolate wafer crumbs with melted butter until evenly combined.
Press the mixture into a 10-inch tart pan with a removable bottom, covering the base and sides evenly.
Bake the crust for 10 minutes, then let it cool completely.
In a bowl, beat cream cheese, peanut butter, sugar, and vanilla until smooth.
In a separate bowl, whip the cold heavy cream until stiff peaks form.
Gently fold the whipped cream into the peanut butter mixture until well combined.
Spoon the filling into the cooled crust, smoothing the top, and refrigerate for about an hour.
For the topping, heat 1/2 cup heavy cream until hot, then pour over the chopped semisweet chocolate. Let it sit for a minute, then stir until smooth.
Let the chocolate mixture cool slightly, then spread it over the chilled peanut butter filling.
Sprinkle chopped salted peanuts around the edges.
Chill the tart in the refrigerator for at least 3 hours before serving.