Preheat the oven to 350 degrees. Prepare a nine-by-nine-inch pan (or whatever size you have that can fit the entire package of Hawaiian rolls in it) by spraying it with cooking spray.
Leave the rolls all connected, and using bread knife, cut the Hawaiian rolls in half to create a top and bottom.
Place the bottom part into the prepared pan. Place the turkey evenly over the rolls, add the cheese, and then finish off with a layer of spinach leaves. Place the top layer of buns on top, and poke just a few holes in the buns with a sharp knife.
In a small bowl, combine the butter, garlic, dijon, onion powder, Worcestershire, garlic salt and pepper, and pour it evenly over top of the rolls, spreading it out with a spoon, if necessary to evenly coat the rolls.
Sprinkle the sesame seeds on top. Cover the pan with aluminum foil and bake for 14 minutes.
Remove the foil and bake for another two minutes or until the tops brown.