01 -
Set oven to 400°F and cover a baking sheet with parchment paper.
02 -
Coat one side of each bread slice evenly with softened butter.
03 -
If you want, sprinkle Parmesan over the buttered sides and press gently to stick it.
04 -
Put 4 slices down with the buttered side facing down, layer cheese on top, and cover with the other slices butter-side up.
05 -
Bake on the lowest rack for 4-5 minutes, flip the sandwiches, and bake another 2-3 minutes until crispy and golden.
06 -
Let cool a bit before cutting and enjoying.