
Nonstick cooking spray, for baking dish
1 1/2 cups icing sugar
1 1/2 cups tennis biscuit crumbs
1 cup smooth peanut butter
Kosher salt
113g (8 tablespoons) unsalted butter, melted
230g dark baking chocolate, chopped into small pieces
1 cup heavy cream
1 teaspoon flaky sea salt, optional