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