Remove bones from chicken breasts, keeping meat in one piece .
Do not remove skin.
Sprinkle cut side with salt.
In skillet cook onion and celery in 2 tablespoons butter till tender.
Add corn, stuffing mix, egg, poultry seasoning, and salt; mix well.
Spoon some corn mixture on cut side of each chicken breast.
Fold over and skewer or tie closed.
Grill over medium-hot coals till tender, 30 to 35 minutes, turning often.
Brush with melted butter during the last 10 minutes.