Another no-fail made-from-scratch recipe from Sunset. A nice, firm cake that makes two perfectly flat two-inch layers that are not too sweet. A perfect cake for a variety of fillings and frostings. Note: To melt chocolate, break it into small pieces and place in a small microwave-safe bowl; cook in microwave at half power, stirring occasionally, until smooth, 2 to 3 minutes. (Watch it closely, stirring occasionally and heat until just melted).