01 - 
                Set your oven to 400°F and cover a baking tray with parchment paper.
              
              
              
                02 - 
                Coat one side of each slice of bread with a thick layer of butter.
              
              
              
                03 - 
                If you're using Parmesan, press it into the buttered sides of the bread.
              
              
              
                04 - 
                Lay 4 slices, butter side facing down, layer on the cheeses, then put on the other slices butter side up.
              
              
              
                05 - 
                Start baking on the bottom shelf for 4-5 minutes. Flip the sandwiches and bake 2-3 minutes more until nicely golden.
              
              
              
                06 - 
                Let it sit for a bit to cool down, then slice and enjoy.