Arrange onion, celery and carrots in bottom of slow cooker. Season chicken thighs with salt and pepper and arrange over vegetables.
In a medium bowl, whisk together tomato sauce, lime juice, chipotle chiles with sauce, and garlic. Pour mixture over chicken.
Cover and cook on low for 6 to 8 hours or high for 3 to 4 hours. Serve half of the thighs with this meal (topped with diced avocado and cilantro and garnished with lime wedges) and reserve remaining thighs for another meal.
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