Slice bread on the diagonal (eg. ///) approximately ½” thick. Place sliced bread in an even layer on a baking sheet.
Brown ¼ cup of butter in a pan – when putting the butter in the pan add sage leaves (the number of bread slices you have), add salt and pepper to taste while allowing all ingredients to brown together in the butter. Remember, the prosciutto is a cured ham, thus there is salt already in the meat, do not add too much into your butter.
Place one slice of prosciutto on each slice of bread - making sure the prosciutto is not hanging over a lot on the bread (kind of clump it, making little waves in the meat).
Slice the mozzarella in ¼” thick slices (the number of bread slices you have), and place on top of the prosciutto.
At 350°, bake the bread in the oven until the mozzarella is melted and just barely turning golden.
Take the bread out of the oven, and spoon your browned butter over top of each slice of bread, don’t over use the butter or everything will be mushy.
Place one sage leave on top of each slice, and now you’re ready to serve!