Preheat oven to 375 degrees. Make filling: In a medium bowl, stir together spinach, ricotta, garlic, teaspoon salt, and ¼ teaspoon pepper; set aside. In another medium bowl, stir together tomato sauce and prosciutto.
In an 8-inch square baking dish, spread cup tomato sauce. Layer 2 noodles, ⅓ filling, and ⅓ remaining tomato sauce; repeat twice. Top with mozzarella and parmesan cheese.
Bake until browned, 35 to 40 minutes. Let stand 5 minutes before serving
Recipe by In Good Taste at http://ingoodtaste.kitchen/spinach-prosciutto-lasagna/