Brown the ground meat in a large skillet over medium-high heat, breaking it up as it cooks. Drain excess fat and transfer to slow cooker.
Add sweet potatoes, black beans, crushed tomatoes, diced tomatoes with green chilies, onion, bell pepper, and garlic to the slow cooker.
Stir in chili powder, cumin, smoked paprika, salt, and pepper until everything is well combined.
Cover and cook on LOW for 6-7 hours or HIGH for 3-4 hours, until sweet potatoes are fork-tender.
Give it a good stir and taste for seasoning, adjusting salt and spices as needed.
Serve in bowls topped with shredded cheese, a dollop of sour cream, and sliced green onions. Cornbread on the side is always a hit!