Pound chicken breasts in a zip-lock bag, until they are around a quarter inch thick.
Combine the salt, garlic powder and pepper in a small bowl, and use it to season the chicken.
Lay the chicken breasts on the counter.
Lay prosciutto, provolone and basil on each one.
Roll them up, using the smallest point in the center.
Tie 2 pieces of kitchen string around each piece to keep it together.
Preheathe grill to medium high.
Grill the chicken over medium heat, with the lid closed unless turning, until brown/gold on all sides, about 12-15 minutes, turning every 3 minutes.
Remove from the grill and let rest for 5 minutes.
Remove the twine from the chicken pieces before serving.