In a small bowl, mix together the salt, pepper, onion powder, and garlic powder. Place the chicken on a cutting board and cut it into bite-sized pieces or strips. Sprinkle the seasoning evenly over the chicken and toss to coat.
Heat 2 tablespoons of olive oil in a large sauté pan over medium-high heat. Add the chicken and cook until browned, cooked through, and no longer pink in the center, about 5–7 minutes. Remove the chicken from the pan and set aside.
Add the remaining 1 tablespoon of olive oil to the pan.Add the chopped onion and cook for 3–4 minutes, until soft and translucent. Stir in the garlic and cook for another 1–2 minutes, until fragrant.
Pour in the chicken broth and bring to a gentle boil. Reduce to a simmer and cook for 2–3 minutes to slightly reduce the liquid.
Add broccoli, and chicken. Cook until broccoli and chicken is heated through.
Stir in the cooked rice and cheese. Reduce heat to low and stir until cheese is melted. Taste and adjust seasoning, then serve warm.