1. Preheat the oven to 425 F and lay 4 slices of bread next to each other on the quarter sheet pan. Place one layer of cheese slices on the bread slices (8 pieces of cheese) followed by an additional layer of cheese on top.
2. Place the remaining slices of bread on top, then generously butter the top of the sandwiches. Flip over the sandwiches and butter the other side of the bread slices.
3. Place the pan into the oven and bake for 8-9 minutes or until a quick peek of the underside of the sandwiches show a golden brown. Remove the pan from the oven and carefully flip each of the sandwiches, before baking for an additional 5-6 minutes in the oven.
4. Remove the sandwiches from the oven and sprinkle with a bit of sea salt. Use a spatula to take the sandwiches off the pan and on to a cutting board or plate, cutting in half to enjoy!

Sandwiches are best if enjoyed immediately, but once the sandwiches have cooled down to room temperature, they can be stored in an airtight container, in the fridge, for later.