Hershey Bar Cake

Yield:	15 Servings
Categories:	Cakes, Chocolate

1		HERSHEY'S milk chocolate bar (7 oz), broken into pieces
1/4	c	Butter or margarine (1/2 stick)
1 2/3	c	Boiling water
2 1/3	c	All-purpose flour
2	c	Packed light brown sugar
2	ts	Baking soda
1	ts	Salt
2		Eggs
1/2	c	Dairy sour cream
1	ts	Vanilla extract