In a 12-inch skillet, melt the butter in the olive oil over medium-high heat. Then add 4 cutlets, prosciutto-side down, into the pan. Cook about 3 minutes on each side. Add the wine to the skillet and cook until the sharp smell of the wine is cooked off, about 3 minutes. Repeat with the remaining cutlets using a clean skillet. Serve the cutlets on a large platter and drizzle with the sauce. Garnish with fresh sage.