Cook chicken cutlets (click the link in the ingredients) or dice up rotisserie chicken to get 1 cup.
Brush the inside of each sub roll generously with softened butter. Sprinkle lightly with garlic powder, then toast in a skillet or broil in the oven until golden and slightly crisp. Let cool slightly, then generously spread mayo on both sides of the rolls.
Pour the contents of the Caesar salad kit into a large bowl. Use tongs to mix until well combined. If using rotisserie chicken instead of crispy chicken, add to the salad.
Divide the salad mixture evenly among the rolls. Divide chicken cutlets evenly on top. Use a zester to grate fresh Parmesan cheese over the top, if desired. Close the sandwich and enjoy!