Crust

8-ounce bag King Arthur Graham Cracker Crust Mix*
6 tablespoons unsalted butter, melted*
*Or substitute 1 1/4 cups finely crushed graham cracker crumbs, 1/4 cup sugar, 1/2 teaspoon cinnamon (optional), and 5 tablespoons melted butter.

Filling

1/3 cup hot water
2 tablespoons King Arthur All-Purpose Cocoa or Double-Dutch Dark Cocoa
1 tablespoon vanilla extract
1 1/3 cups bittersweet chocolate chips, chunks, or disks
1 1/2 cups heavy cream
1 tablespoon granulated sugar
1/8 teaspoon salt

Topping

1 cup heavy cream
2 tablespoons confectioners' sugar
2 tablespoons whipped cream stabilizer, optional, for holding power