1. Heat a skillet over medium-high heat. Add oil to pan; swirl to coat. Add onion and next 4 ingredients (through garlic); cook 10 minutes or until vegetables are tender. Scrape onion mixture into a 6-quart electric slow cooker. Add hocks, beans, and stock. Cover and cook on LOW for 8 hours or overnight.
2. Remove hocks from pan; cool slightly. Remove meat from bones; discard fat, skin, and bones. Chop meat; stir into beans. Cook 10 minutes to allow flavors to meld. Sprinkle with chives and black pepper.
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