Preheat oven to 350 degrees F.
Slice bread loaf in half, horizontally, and remove enough of crumb to make room for fillings. Layer the olive salad, meats and cheeses on bottom half of bread, drizzle with olive oil, and season to taste with salt and pepper. Replace top half of bread and wrap sandwich in aluminum foil.
Bake until muffaletta is warmed throughout and cheese is melted, about 30 minutes.The sandwich can also be served at room temperature. Allow it to sit for at least 1 hour for the flavors to marry and the oil to soak into the bread.
Cut in pieces to serve.
Yield: 4 to 6 servings