01 -
In a bowl, combine shredded chicken, mayonnaise, Dijon mustard, salt, and black pepper. Stir until evenly coated.
02 -
Lay one slice of garlic bread on a surface. Evenly spread the chicken mixture over it. Sprinkle mozzarella and Parmesan cheese on top, then close with the second slice of garlic bread.
03 -
Preheat a non-stick skillet over medium heat. Place the assembled sandwich in the skillet and cook for 4 to 5 minutes or until golden brown. Carefully flip and cook the opposite side until crisp and the cheese is fully melted.
04 -
Remove from the skillet, slice in half if preferred, and serve hot.