Mix all of the blackening spices together in a small bowl. Make sure it is blended evenly.
Brush one side of each chicken breast (or thigh) generously with melted butter.
Generously spoon on the blackening seasoning.
Heat a large cast iron skillet to high heat and add the chicken, buttery-seasoned side down.
Cook 3-5 minutes to blacken.
Brush or drizzle on the remaining butter, then generously add more seasoning.
Flip the chicken and cook another 2-3 minutes, or until the chicken is cooked through. It should measure 165 degrees F. internally when measured with a meat thermometer.
IF DESIRED: Just after you flip the chicken, add some sliced jalapeno peppers or serrano peppers to the pan for extra heat and for serving with the chicken.
Squeeze on lemon juice. Garnish with sliced peppers, fresh chopped parsley, spicy chili flakes and serve!
