Tex-Mex
Toss the chicken with 1 tbsp of oil, the chili powder, cumin, garlic powder and 1 tsp of salt, and leave for 15 minutes.
Rinse the rice, fry it in the remaining oil for 1 minute, add the water and 1/2 tsp of salt, cover and simmer on low for 15 minutes, then rest for 5 minutes.
For the salsa, mix the tomatoes, onion, jalapeno, half of the cilantro, half of the lime juice and 1/2 tsp of salt.
Cook the chicken in a hot skillet or grill pan for 5-6 minutes per side, until cooked through, rest for 5 minutes and slice.
Warm the black beans in a small pan over low heat for 5 minutes, stirring now and then.
Fluff the rice with the remaining lime juice and cilantro.
Divide the rice among 4 bowls and top with the chicken, beans, salsa, cheese and lettuce.