Heat oven to 450°F. Spray 13x9-inch (3-quart) glass baking dish with cooking spray. In 4-quart Dutch oven, heat oil over medium-high heat. Cook turkey in oil 4 to 6 minutes, stirring frequently, until no longer pink. Stir in salsa and flour. Cook 2 to 3 minutes, stirring constantly, until slightly thickened.