Break up the cranberry sauce in a buttered 13x9x2 inch baking dish, spreading sauce over bottom.
Dot with butter.
Prepare batter from cake mix according to package directions; pour evenly over sauce.
Bake in moderate oven (350Â°) 30 minutes or until done.
Cut in squares, turning each upside down as you place it on plate.
Serve warm with Yankee Sauce.
Note: If you like, make the cranberry sauce by cooking 3 cups fresh cranberries, 1 1/2 cups sugar, and 1/3 cup water till the skins pop, about 5 minutes.