Instructions:
Preheat grill to medium low heat
Butter fly your chicken, by cutting it horizontally.
Do not cut all the way through. Sprinkle the inside of the chicken with pepper. Evenly top the the chicken with cheese and fold over the chicken to close it. It should look like the chicken breast before you cut it.
In a microwave safe bowl, melt the butter for 8 seconds. Stir in hot sauce and celery salt
Brush one side of the chicken with hot sauce mixture and place the hot sauce size down on the grill. Brush more hot sauce over top of chicken. Cook for about 7 minutes.
Flip the chicken and brush on remaining hot sauce and cook until no longer pink; about 5 minutes more.
You can make it the same way, just by cooking it in the oven. Just heat your oven to 375 degrees, spray a baking dish with cooking spray, add the chicken and drizzle the hot sauce over the top.
Place it in the oven for about 35 minutes and it will be done.