01 -
Combine softened unsalted butter, grated parmesan cheese, Italian seasoning, garlic powder, and salt in a small bowl until uniform. Set aside.
02 -
Spread a thin layer of pizza or marinara sauce on four slices of bread. Layer evenly with shredded mozzarella and six slices of pepperoni per sandwich. Top with remaining bread slices.
03 -
Spread garlic butter generously on the exterior sides of each assembled sandwich.
04 -
Heat a skillet over medium heat. Grill sandwiches for 3 to 4 minutes per side, pressing lightly, until bread is golden brown and cheese has melted.
05 -
Slice sandwiches and serve warm with additional marinara sauce for dipping, if desired.