In 10-inch nonstick skillet, cook chicken 5 to 7 minutes, stirring frequently, until browned and no longer pink in the center.
Spray 3- to 4-quart slow cooker with cooking spray. In cooker, mix chicken and remaining ingredients except gnocchi and peas.
Cover; cook on Low heat setting 8 to 10 hours.
Increase heat setting to High. Stir in gnocchi and peas. Cover; cook about 30 minutes longer or until gnocchi and peas are tender.