Blueberry Cake Roll

Yield:	10 Servings
Categories:	Cakes, Cupcakes

3/4	c	Powdered sugar; sifted
1/2	c	Unbleached flour
5		Egg whites
1	ts	Cream of tartar
1/2	ts	Vanilla extract
1/8	ts	Salt
2	oz	Cool whip Lite?; thawed
8	oz	Low fat blueberry yogurt; or other flavor
		Additional powdered sugar; optional