If you have time and want a richer flavor, quickly sear the chicken thighs in a skillet with olive oil over medium-high heat for 2–3 minutes per side; this step adds depth but can be skipped to keep everything in one pot.
Scatter the cubed sweet potatoes into the bottom of the slow cooker. Place the chicken on top, then add the diced tomatoes, black beans, corn, minced garlic, and chicken broth.
Stir in chili powder, cumin, smoked paprika, coriander (if using), and a pinch of salt and pepper. Give everything a gentle stir to distribute the spices.
Cover and cook on low for 6–8 hours or on high for 3–4 hours, until the sweet potatoes are tender and the chicken shreds easily with a fork.
Remove the chicken thighs and shred them with two forks. Return the shredded chicken to the pot and stir to combine. Taste and adjust seasonings as needed.
If you like a thicker chili, uncover and cook on high for an additional 15–20 minutes to reduce some of the liquid, or whisk in a slurry of 1 tablespoon cornstarch and 2 tablespoons water and cook until thickened.
Ladle into bowls and serve with your favorite toppings—a squeeze of lime, chopped cilantro, avocado slices, shredded cheese, or a dollop of yogurt.