1Heat oven to 400°F. Spray broiler pan rack with cooking spray. In large bowl, mix ground beef, bread crumbs, onion, 1 tablespoon mustard, the salt and 1/4 teaspoon pepper. Shape into 24 (1 1/4-inch) balls; place on rack in pan.
2Bake uncovered 20 to 25 minutes or until thoroughly cooked and no longer pink in center.
3In 2-quart saucepan, mix flour, cornstarch, bouillon granules and water; stir in all remaining ingredients except noodles. Cook uncovered over medium heat, stirring constantly, until mixture thickens and boils. Boil and stir 1 minute. Add meatballs; stir gently. Serve over noodles.