Use chef Kierin Baldwin's irresistible chocolate crumb base to make her Devil's Food Cake with Black Pepper Boiled Icing recipe.
Preheat oven to 350 degrees.
Place graham cracker crumbs, cocoa powder, turbinado sugar, and salt in the bowl of a food processor; pulse to combine. Add melted butter and continue pulsing until well combined. Add egg whites and continue pulsing until crumbs begin to stick together.
Trace an 8-inch circle on a piece of parchment paper. Place paper pencil-side down on a baking sheet. Turn crumb mixture out onto parchment and form into a flat, even 8-inch disc, using the tracing as a guide.
Transfer to oven and bake until firm and middle appears dry, 12 to 15 minutes. Let cool completely before using.