Allow dough to thaw on a floured surface (you'll know it's thawed enough when you can unfold it).
Unfold each sheet and lay flat. Brush with olive oil, and sprinkle with salt, pepper, and garlic salt.
Sprinkle 1 cup of cheese over each sheet, pressing it down firmly into the dough with your fingers.
Cut each sheet into 1" strips (there will be about 6 strips from each sheet).
Twist each strip and set it on a parchment-lined baking sheet.
Bake for 10-15 minutes, until cheese is melted and breadsticks start to turn golden.
Notes
Place the leftovers from this breadsticks recipe in an airtight container after they have cooled down to room temperature. Enjoy them the next day or up to 3 days later.