Heat olive oil in large pot over medium heat.
Add in chopped onion and bell pepper, cook until onion is soft and fragrant.
Add in the diced tomatoes, black beans, green chilis and diced sweet potatoes.
Top with the garlic powder, chili powder, salt, pepper and chopped fresh cilantro, if desired.
Add about 1.5 - 2 cups of water, just enough to reach the top of the sweet potatoes, stir.
Bring to a boil and then reduce to simmer.
Cover and simmer for 45 minutes.
Serve with your favorite chili toppings.
Enjoy!