Place the chicken breast in a bowl, sprinkle smoked paprika, garlic powder, and chili powder and drizzle one tablespoon of the oil. Use your hands to rub all the seasonings on the chicken and make sure it is well coated.
Set aside for 10-15 minutes to marinate.
Preheat the grill to 425 degrees F or cast iron pan over medium high heat.
Place the chicken on your preheated grill and cook for 5 minutes on each side or until the internal temperate reaches 165 degrees F. The cooking time will vary depending on the size of the chicken. Once cooked, place on a cutting board and let it rest before slicing.
In a pan, add the remaining 1 tablespoon of the oil over medium heat and add the bell peppers and salt and pepper and sauté them until they soften.
After 4-5 minutes, add the onions to the pan with bell peppers and sauté the onions for additional 3-4 minutes.
Slice the chicken and assemble your bowl. Add the chicken, avocado, cherry tomatoes, and bell peppers and onion over brown rice.
Squeeze lime juice and garnish with cilantro.