Mix together graham cracker crumbs, melted butter, chocolate chips and nuts (optional). Make chocolate cake mix according to directions on mix. Pour batter in 2 pans. Sprinkle graham cracker crumb mixture over batter. Bake at 350 degrees for 30-35 minutes.
Remove cakes from pans. Cool on rack, crumb side up. When cakes are cool, spread whipped cream between layers and on all sides.