Here's another one from Grannie...
Mississippi Mud Cake
1 3/4 cup flour
2 cup sugar
3/4 cup cocoa
2 t soda
1 t baking powder
1 t salt
Sift above together into a bowl
Add:
2 eggs
1 cup strong coffee or 2 tsp instant coffee and 1 cup water
1 cup sour milk (or add 1 Tablespoon of vinegar to a cup of milk)
1/2 cup oil
1 tsp vanilla
Pour into a greased 9X13 pan
Bake at 350 for 3-40 minutes.