Hanukkah Latkes

Yield:	6 Servings
Categories:	Vegetables

3	c	Baking potato; 1 1/4 pounds, cubed and peeled
2	tb	All-purpose flour
1/2	ts	Salt
1/4	ts	Baking powder
1/8	ts	Pepper
2		Egg whites
1	sm	Onion; quartered
1	tb	Vegetable oil; divided
6	tb	Nonfat sour cream
		Sliced green onions; optional