Chocolate Sheet Cake with Milk Chocolate Frosting
Why This Recipe Works
For a cake that boasted deep chocolate flavor and color, we used a combination of Dutch-processed cocoa and melted bittersweet chocolate; the cocoa offered pure, assertive chocolate flavor while the chocolate contributed complexity as well as fat and sugar. Neutral-tasting oil allowed the chocolate flavor to shine. To minimize cleanup, we mixed the wet and dry ingredients directly into the saucepan where we’d melted the chocolate with cocoa and milk. A milk chocolate ganache contrasted nicely with the deeper flavor of the cake. To make the ganache thick, rich, and creamy, we added plenty of softened butter to the warm chocolate-cream mixture, refrigerated the frosting to cool it quickly so that it would spread nicely, and gave it a quick whisk to smooth it out and lighten its texture.