In a large zip-top bag, combine cumin, cinnamon, 3/4 teaspoon salt and 1/2 teaspoon pepper; add chicken and toss to coat. In a large skillet, heat oil over medium-high. Cook chicken, skin side down, until golden, about 4 minutes; flip and cook 2 minutes.
In a 5- to 6-quart slow-cooker, place onion, garlic and ginger. Add chicken, skin side up, then top with tomatoes and their liquid, and raisins. Cover and cook on high until chicken is tender, 3 1/2 hours (or 6 hours on low).
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