A serve-from-the-pan chocolate cake with a surprise ingredient -- sour cream! Try it for Wurstfest or some other German celebration.
**I sifted the powdered sugar before measuring so it was fluffy and only weighed about 3 ounces per cup. If you want to skip sifting because you plan on beating the lumps out with the mixer, just weigh out 12 ounces of un-sifted powdered sugar or measure out about 2 3/4 cups (volume) of powdered sugar. Whatever you do, don’t measure out 4 cups of un-sifted powdered sugar or you’ll be using over a pound of it. That being said, I recommend taking the time to sift the powdered sugar.