Spray 4-quart slow cooker with cooking spray; place chicken breasts in cooker.

In medium bowl, mix remaining ingredients except spaghetti. Pour over top of chicken

Cover; cook on Low heat setting 6 hours or on High heat setting 3 to 4 hours.

When about 15 minutes are left, cook and drain spaghetti as directed on package.

Just before serving, shred chicken with 2 forks, and toss creamy chicken mixture with cooked spaghetti.