Heat oven to 425ºF. Butter or spray with cooking spray 8-inch square (2-quart) glass baking dish. In 10-inch skillet, cook sausage over medium-high heat, stirring frequently, until no longer pink; drain. In baking dish, mix sausage and frozen vegetables. In small bowl, mix broth and flour until smooth; pour over sausage mixture. Gently stir.