Heat oven to 425° F.
Place the bread on a baking sheet, cut-side up. Spoon the sauce over the top.
Place the salami on half the bread and the spinach on the other half.
Top both halves with spoonfuls of ricotta and sprinkle with the mozzarella and Parmesan.
Bake until the cheeses are melted, 5 to 7 minutes. Cut into pieces.