Ranch-Style White Sauce: Melt margarine in small saucepan over low heat. Stir in flour; cook 1-2 minutes, stirring constantly. Using wire whisk, stir in milk; bring to a boil. Cook, whisking constantly, 1-2 minutes or until thickened. Stir in dressing mix and pepper. Preheat oven to 350?F. Prepare white sauce. Set aside. Spray medium skillet with nonstick cooking spray; heat over medium-high heat. Add onion and garlic; cook 2-3 minutes or until tender. Remove half of onion mixture. Set aside. Add mushrooms to skillet and cook about 5 minutes or until tender. Combine mushroom mixture, beans and sauce in 1 1/2 quart casserole. Spray medium skillet with nonstick cooking spray; heat over medium heat. Add bread crumbs to skillet; spray top of crumbs lightly with nonstick cooking spray. Cook 3-4 minutes or until crumbs are golden. Stir in reserved onion mixture and parsley. Sprinkle bread crumb mixture over casserole. Bake, uncovered, 20-30 minutes or until heated through. Mastercook formatted for your cooking pleasure by Pamela Creeden (creedenites@sprintmail.com) Recipe by: Best Recipes--101 Casseroles, p.86 Recipe by Charlottes Garden Newsletter Posted to MasterCook Digest by "Pam & Mike Creeden" on Nov 24, 1998,