01 - Set a skillet over medium heat and allow it to preheat.
02 - Evenly spread the softened butter on one side of each bread slice.
03 - On the unbuttered side of two bread slices, spread pizza sauce in a thin, even layer.
04 - Distribute shredded mozzarella, mini pepperoni slices, a pinch of dried oregano, and a sprinkling of parmesan cheese over the sauced sides.
05 - Place the remaining bread slices on top, buttered side out, to form two sandwiches.
06 - Transfer assembled sandwiches to the preheated skillet. Cook for 3 to 4 minutes per side, pressing gently, until the exterior is golden brown and the cheese is fully melted.
07 - Remove sandwiches from heat and let them rest for 1 minute before slicing.
08 - Serve warm, accompanied by additional pizza sauce for dipping.