FOR THE CAKE: – 1 cup (100g) graham cracker crumbs (from about 8 whole crackers) – 1/4 cup (30g) all-purpose flour – 1 teaspoon baking powder – 1/4 teaspoon salt – 6 tablespoons (85g) unsalted butter, softened – 1/4 cup (50g) granulated sugar – 1 large egg – 1 large egg yolk – 1 teaspoon vanilla extract – 1/4 cup milk – 3/4 cup (127g) semisweet chocolate chip FOR THE FROSTING: – 1/2 cup (113g) unsalted butter, softened – 1/2 cup (55g) confectioners' sugar, sifted – 1/2 teaspoon vanilla extract – 1/2 cup (64g) marshmallow creme (such as Marshmallow Fluff)