01 - Lay out all bread slices. Spread a thin layer of softened butter on one side of each slice.
02 - Flip two slices buttered side down. Spread 1 tablespoon marinara sauce evenly on each slice.
03 - Sprinkle half the mozzarella cheese over the sauced bread slices, ensuring even coverage.
04 - Arrange pepperoni slices over the mozzarella layer, distributing evenly between both sandwiches.
05 - Sprinkle remaining mozzarella and half the Parmesan cheese over the pepperoni.
06 - Place remaining bread slices on top, buttered side facing outward to create the complete sandwich.
07 - Heat non-stick skillet over medium heat. Cook sandwiches 3-4 minutes per side, pressing gently with spatula, until bread turns golden brown and cheese melts completely.
08 - Sprinkle oregano, garlic powder, and remaining Parmesan cheese over sandwiches during final minute of cooking.
09 - Cut each sandwich diagonally in half and serve immediately with extra marinara sauce for dipping.