2 lbs. green beans, trimmed, cut into 2-inch pieces and blanched
1/4 cup plain dry bread crumbs
Preheat oven to 375°.
Melt 2 tablespoons margarine in 2-quart saucepan and cook mushrooms and onion, stirring occasionally, until mushrooms are tender, about 5 minutes. Stir in flour and cook, stirring constantly, 1 minute. Stir in water, cream, Knorr® Homestyle Stock - Chicken, thyme and pepper. Bring to a boil over high heat. Reduce heat to low and simmer, stirring occasionally, until thickened, about 3 minutes.
Arrange green beans in large shallow casserole, then pour on sauce. Melt remaining 2 tablespoons margarine and blend with bread crumbs; sprinkle over green beans.