Slice the brioche burger bun in half and layer three slices of Muenster cheese (and salami if using) inside.

Heat a pan over medium heat. Butter the outside of the sandwich and place it in the pan.

Smash the sandwich down with a heavy object, like a sauce pot or a water bottle. Cook for 5 minutes.

Flip the sandwich and cook for another 5 minutes until the bread is crispy and the cheese is melted.

Remove from the pan, slice, and enjoy the cheesy, crispy goodness.