Beat all cake ingredients together until smooth. Pour into a sheet pan with sides (about 26 by 18 inches) Bake at 350 degrees until center is set and toothpick test comes out clean – about 20 minutes.
Optional: If you prefer, you can bake in a 9X13 pan for a thicker cake. Bake for 30-35 minutes, testing with a toothpick for doneness.
While cake is baking, make the glaze. Stir all the ingredients together and heat to boiling. Boil 2 minutes.
When the cake comes out of the oven, pour the hot glaze over it. Let cool before cutting into squares and serving.
Keyword german brown cake, old fashioned prune cake, prune cake