preheat oven to 400ºF.
In a small bowl, combine the Cajun seasoning ingredients, and whisk until combined. Set aside.
Gently pat the chicken dry, and generously sprinkle the cajun mix on both sides.
Heat the coconut oil in a skillet over medium to medium-high heat. Carefully lay the seasoned chicken in the hot skillet, and cook it for 3-5 minutes (per side) until lightly blackened.
Transfer the skillet into the oven. Cook 10-20 minutes (or until the internal temperature reaches 165ºF).
While the chicken is cooking, create your salsa. In a medium bowl, toss the salsa ingredients together, and set it aside.
Remove the chicken from the oven, and allow it to rest for 5 minutes. Then slice the chicken into thin strips.
Take one romaine lettuce leaf. As if it were a taco shell, spoon a few slices of chicken and the salsa into the leaf. Serve and enjoy!