In 10-inch skillet, cook beef over medium-high heat 6 to 8 minutes, stirring occasionally, until thoroughly cooked; drain.
Spray 3 1/2- to 4-quart slow cooker with cooking spray. In cooker, place beef and remaining ingredients except toppings.
Cover; cook on Low heat setting 7 to 9 hours. Garnish each serving with toppings.