Name: Panino di Prosciutto e Fontina
Prep time: 5 min
Cook time: 8 min
Yield: 1
Cuisine: Italian
Ingredients: 2 to 4 slices (3 ounces total) fontina cheese; 2 slices (1/2-inch-thick) rustic white bread; 2 paper-thin slices red onion (optional); Salt; Freshly ground black pepper; 6 fresh baby spinach leaves; 1 to 2 paper-thin slices (1/2-ounce) prosciutto; 2-3 tsp olive oil