1. Place the chicken breast in the freezer for 30-45 minutes.
2. Preheat your oven to 400 degrees. Spread butter on the interior of the hoagie rolls and sprinkle with garlic powder. Arrange on a baking sheet in a single layer and set aside.
3. Remove the chicken from the freezer, slice it as thinly as possible then chop it into smaller pieces, about 1/4-inch to 1/2-inch. Toss the chicken with the garlic powder and salt and set aside.