Spinach, Rice and Feta Pie

Yield:	6 Servings
Categories:

2	ts	Margarine
1/4	c	Chopped onion
2	ts	All-purpose flour
1/2	ts	Salt
1/4	ts	Pepper
1 1/2	c	Low-fat milk
2	c	Cooked long-grain rice
3/4	c	(3 oz.) crumbled feta cheese
1	lg	Egg; lightly beaten
2	lg	Egg whites
1	pk	(10-oz.) frozen spinach; thawed, drained and squeezed dry
		Olive oil-flavored cooking spray
2	tb	Grated Parmesan cheese