Vanilla Cupcakes

Yield:	12 Servings
Categories:

1/3	c	Butter or margarine; not spread, softened
2/3	c	Sugar
1/2	ts	Baking powder
1/2	ts	Baking soda
1	lg	Egg
1	ts	Vanilla
		Lowfat vanilla yogurt; mixed with:
1/3	c	1% milk
1 1/3	c	Flour
		Vanilla Buttercream Frosting