b'YOU WILL NEED6 tablespoons olive oil3 pounds white onions, thinly sliced6 garlic cloves, thickly sliced1 tablespoon chopped fresh thyme1 tablespoon chopped fresh Italian parsley1 tablespoon chopped fresh basil1 tablespoon chopped fresh sage tablespoon red pepper flakes1 cups finely chopped prosciutto, divided1 cups crumbled Gorgonzola cheese, divided 1 cup dry Marsala wine 1 tablespoon flour5 cups chicken stockteaspoon salt teaspoon black pepper1 cup croutons'