Heat oven to 350°.
Mix all ingredients; pour into un-greased baking dish, 11 1/2 x 7 1/2 x 1 1/2 inches.
Place baking dish in pan of hot water (1 inch deep).
Bake uncovered about 1 to 1 1/4 hours or until knife inserted 1 inch from edge comes out clean.
Cut into squares; 'if desired, serve with Quick Mushroom Sauce