In a large bag combine all of the spice coating ingredients and smoosh to blend well.  Add the chicken to the spice mixture, squish it around to make sure all the pieces are covered with the spice coating and allow the chicken to marinate for a few hours or overnight.  Preheat oven to 450F.  Line a baking pan with foil and spray with cooking spray.  Lay the chicken breast pieces with what would have been the skin-side up, on the pan and bake for 15-20 minutes until cooked through.  Allow to rest for 10 minutes before slicing.

While the chicken is resting, in a small bowl combine the melted butter, lime juice, minced Serrano & onion. Drizzle the lime butter over the chicken pieces and garnish with fresh lime slices.