1Spray 3- to 4-quart slow cooker with cooking spray. In cooker, place cheese, salsa, beans and chicken.
2Cover; cook on Low heat setting 2 hours, stirring once halfway through cooking.
3Stir in sour cream, bell pepper and onions. Increase heat setting to High. Cover; cook about 45 minutes longer or until mixture is hot.
4Serve with tortilla chips. Topping can be kept warm on Low heat setting up to 2 hours; stir occasionally.