01 -
Heat skillet over medium heat.
02 -
Spread butter on one side of each bread slice.
03 -
Place bread butter-side down, layer with mozzarella, chicken, marinara, more mozzarella, and top bread butter-side up.
04 -
Grill 3-4 minutes per side until golden brown and cheese melts. Optional: sprinkle with Parmesan before serving.