Chocolate Peanut Butter Caramel Mousse Pie

For the crust::

Oreo cookies (regular-stuffed, filling intact)

unsalted butter, melted

For the filling::

semisweet chocolate, chopped

heavy cream

salted caramel sauce, store-bought or homemade

For the peanut butter whipped cream::

heavy cream

smooth peanut butter

confectioners' sugar

vanilla extract

Additional caramel sauce, for drizzling

Additional peanut butter, melted, for drizzling

Additional semisweet chocolate, melted, for drizzling