01 -
Spread marinara sauce on one side of each bread slice.
02 -
Layer mozzarella cheese on one slice, add pepperoni, and top with more cheese if desired.
03 -
Close the sandwich with the second slice of bread, sauce side in.
04 -
Butter the outer sides of the sandwich.
05 -
Heat a skillet over medium-low heat and place the sandwich in the pan. Cook until golden brown on one side, about 4–5 minutes.
06 -
Flip the sandwich carefully and cook the other side for another 4–5 minutes until the cheese is melted and the bread is crisp.
07 -
Remove from skillet and let rest for 1–2 minutes before slicing.