Brown the beef - Heat olive oil in a large pot over medium-high heat. Add the ground beef and cook, breaking it apart with a spoon, until browned and no longer pink. Drain any excess fat, leaving just a thin coating.
Sauté the vegetables - Add the onion, sweet potatoes, red bell pepper, and garlic. Cook for 5 to 7 minutes, stirring occasionally, until the onions are translucent and the vegetables start to soften.
Bloom the spices - Stir in chili powder, smoked paprika, cumin, oregano, salt, and black pepper. Cook for about 1 minute to release the flavors.
Add liquids, bouillon, beans, tomatoes, and chilies - Pour in the broth and add the two beef bouillon cubes, black beans, fire-roasted diced tomatoes, and chopped green chilies with their juices. Stir to combine. As the chili simmers, the bouillon cubes will dissolve on their own.
Simmer until tender - Cover and reduce heat to a gentle simmer. Cook for 30–35 minutes, stirring occasionally, until the sweet potatoes are tender and the flavors meld.
Taste and adjust seasoning - Taste the chili and adjust salt, pepper, or spices as needed. Serve hot with your favorite toppings.