Chocolate Muffins

Yield:	12 Servings
Categories:

2/3	c	Cocoa; Dutch-process or natural
1 3/4	c	Flour
1 1/4	c	Light brown sugar
1	ts	Baking powder
1	ts	Baking soda
3/4	ts	Salt
6	oz	Chocolate chips; (optional)
2		Eggs
1	c	Milk
2	ts	Vanilla
2	ts	Vinegar
1/2	c	Butter or margarine; melted