Heat a bit of oil in a large skillet over medium heat. Add diced onions and sauté a few minutes until they start to soften.
Add chicken, cumin and chili powder and cook until chicken is cooked through.
Add black beans a cook another minute, stirring to combine, until the beans are warmed through.
Serve over hot cilantro lime rice (or plain rice) and top with your favorite burrito/taco toppings.