03Reduce the heat to very low. Sprinkle the breasts evenly with the chopped or dried sage. Top each breast with a piece of prosciutto, then divide the cheese slices evenly among the breasts. Cover the pan tightly and cook until the cheese is melted, about 1 1/2 minutes. Transfer to a serving platter and tent with aluminum foil, being careful not to allow the foil to touch the cheese.
04Increase the heat to high. When the pan is sizzling, add the wine and deglaze the pan, stirring to scrape up any browned bits stuck on the pan bottom. Boil until reduced to 1/4 cup, about 3 minutes. Remove from the heat and whisk in the remaining 1 Tbs. butter.
05Spoon an equal amount of the sauce over each breast, then garnish with a sage leaf. Serve immediately. Serves 4.