In 12-inch nonstick skillet, cook turkey over medium-high heat 5 to 7 minutes, stirring frequently, until no longer pink; drain.
Spray 4- to 5-quart slow cooker with cooking spray. In cooker, mix turkey and remaining ingredients except sour cream and cheese.
Cover; cook on Low heat setting 8 to 10 hours.
Stir well before serving. Top each serving with dollop of sour cream and sprinkle of cheese.