Mix marinade ingredients and coat chicken completely. Rest 20 minutes minimum.
Cook rice in chicken broth 18 minutes covered. Rest 5 minutes, fluff, stir in butter, lime juice, zest, and cilantro.
Sear marinated chicken in hot cast iron 5–6 minutes per side until 165°F. Rest 5 minutes then slice.
Char corn in a dry hot skillet until dark spots form, about 5 minutes.
Warm black beans in a small saucepan with salt and cumin.
Assemble — rice base, chicken, beans, corn, tomatoes, avocado, cheese, sour cream, cilantro, lime, and hot sauce.