Heat olive oil in a skillet over medium heat.
Add diced onion and bell pepper, sauté until soft.
Stir in garlic and cook for 1 minute.
Incorporate diced sweet potatoes, chili powder, and cumin.
Add brown rice and broth, stirring to combine.
Bring to a simmer, then cover and reduce heat.
After about 20 minutes, add black beans, salt, and pepper.
Uncover and check for doneness; if necessary, cook longer.
Fluff with a fork, season to taste, and garnish with cilantro.