1Spray 4- to 5-quart slow cooker with cooking spray. In slow cooker, mix all ingredients except pasta and spinach.
2Cover; cook on Low heat setting 7 to 9 hours (or on High heat setting 3 hours 30 minutes to 4 hours 30 minutes).
3Stir in pasta and spinach until spinach is wilted. If cooking on Low, increase heat setting to High. Cover; cook 25 minutes longer or until pasta is tender. Serve immediately for soup consistency, or let stand for thicker, stew-like consistency.