Lay out 2 slices of bread.
Place 7 pepperonis on one slice of bread.
Top pepperoni with 2 Tablespoons marinara sauce.
Lay 2 fresh mozzarella slices over sauce, then place 2 tomato slices on mozzarella.
Sprinkle 2 Tablespoons Parmesan cheese over everything, then top with other slice of bread.
Spread garlic butter on one side and place that side down on a preheated griddle.
Butter the top side and flip when golden.
Grill until both sides are crisp and cheese is melted (about 2–4 minutes per side).
Repeat steps for all 4 sandwiches. Serve with marinara for dipping.
