Spray 4 to 5-quart slow cooker with cooking spray. Cut ribs into 2-rib portions; place in slow cooker covering entire bottom. Sprinkle with salt and pepper. Stir together cranberry sauce, chili sauce, onion, vinegar and garlic. Spoon over ribs. Cover and cook on low for 6 to 7 hours or until ribs are tender. Remove ribs from slow cooker. Discard liquid. Makes 6 servings