Heat olive oil in a large pot over medium heat. Add the diced onion and cook until translucent, about 3-4 minutes.
Add the minced garlic, chili powder, cumin, and paprika to the pot. Stir and cook for another 1-2 minutes, allowing the spices to become fragrant.
Add the sweet potatoes, red bell pepper, and black beans to the pot. Stir everything together to coat with the spice mixture.
Pour in the diced tomatoes and vegetable broth. Bring the mixture to a gentle simmer, then cover the pot and let it cook for about 20-25 minutes, or until the sweet potatoes are tender.
Season the chili with salt and pepper to taste. Feel free to adjust the seasonings to your preference, adding more chili powder for extra heat.
Serve your Sweet Potato & Black Bean Chili hot, garnished with your choice of toppings. Shredded cheddar cheese, a dollop of sour cream, chopped green onions, and fresh cilantro all make wonderful additions.