Melt 2 tablespoons butter in 1 1/2-quart saucepan over medium heat. Stir in flour, salt, onion powder and caraway seed. Cook, stirring constantly, until mixture is smooth and bubbly; remove from heat. Stir in milk. Heat to boiling, stirring constantly. Boil and stir 1 minute. Stir in cheese until melted. Stir in vegetables.