In a blender, combine the ground cumin, chili powder, dried oregano, salt, pepper, garlic, orange zest, lime zest, and juice. Blend until smooth. Marinate the diced chicken in half of this mixture for at least 30 minutes.
Heat the vegetable oil in a skillet over medium-high heat. Once hot, add the marinated chicken and cook for 10-12 minutes until browned and cooked through. Stir occasionally to ensure even cooking. In the last 5 minutes, add the remaining marinade to the pan to enhance the flavors.
To assemble the bowls, divide the cilantro-lime rice among four bowls. Top each bowl with the cooked chicken and black beans. For added flavor, you can include mango salsa or fried plantains on the side.
Notes
For a vegetarian option, substitute chicken with tofu or extra beans.