Heat 1 teaspoon of the oil in a large nonstick skillet over high heat. Add half of the ground chicken and 1/2 teaspoon salt, cook, breaking the meat apart with a wooden spoon, until browned, about 4 minutes. Transfer the chicken to a 4- to 6-quart slow cooker insert. Repeat with the remaining chicken using another 1 teaspoon of oil and another 1/2 teaspoon of salt.
Turn the heat down to medium and add the remaining 1 teaspoon of oil to the skillet. Add the garlic and onions, stirring and scraping up any browned bits in the pan, until the onions soften, about 5 minutes. Add the chili powder, cumin, cinnamon and clove, and stir constantly for 1 minute to cook the spices. Pour in the chicken broth and scrape the bottom of the pan. Transfer to the slow cooker, along with the pinto and cannellini beans and their bean liquid, the diced tomatoes, sun-dried tomatoes, chipotle, molasses, Worcestershire sauce, 2 teaspoons salt and some black pepper. Cover and cook on the low setting for 6 hours.
Serve with scallions, lime wedges and sour cream, if using.