Chocolate, walnuts, and marshmallows make up the winning combination of Rocky Road. This tart has a soft, brownie-like filling that is topped with walnuts and marshmallows bathed in chocolate.
Preheat the oven to 350°F (175°C). Place the pan containing the crust onto a baking tray.
Place the butter and unsweetened and semisweet chocolates in a metal or glass bowl, and stir the mixture over a pot of barely simmering water until the chocolate