In a small bowl, combine the oregano, cumin and corriander and 1/4 tsp of the salt. Rub the chicken with the spice mixture, drizzle with oil and cook in a non-stick skillet on medium heat.
While the chicken is cooking, make the salsa : combine the tomato, cucumber, parsley, vinegar, pepper and remaining salt. Refrigerate salsa till chicken is done. After chicken is cooked, spoon salsa over chicken and serve.
I actually made 10 times the amount of the spice mixture and put it in an extra salt shaker so when I make this chicken, I just shake a little of the spices on while it is cooking.