1Heat oven to 350°F. In 2-quart saucepan, melt 2 tablespoons butter over medium heat. Stir in flour and bouillon granules. Gradually stir in milk, cooking and stirring constantly with wire whisk, until mixture boils and thickens. Stir in mayonnaise and mustard until well blended.
2In ungreased 12x8-inch (2-quart) glass baking dish, arrange broccoli spears. Top with chicken. Spoon sauce over chicken. Sprinkle with cheese.
3In small bowl, mix topping ingredients; sprinkle over top. Bake about 30 minutes or until thoroughly heated.