Dice onion and cube the sweet potatoes. Drain and rinse black beans.
Layer sweet potatoes, onion, and then beans into a slow cooker; place chicken on top.
In a small bowl, whisk together the broth, salsa, chipotle peppers, paprika, garlic powder, pepper, allspice, and salt.
Pour over the chicken. Don't stir.
Cover and cook on low for 7-8 hours or on high for 3.5-4 hours until chicken is no longer pink in the center.
Garnish with cilantro and lime wedges if desired. Serve with pear slices on the side. (Serving size is 3/4 cup of potatoes and beans, 3-4 ounces chicken and 1/2 pear).