Cut bread in half lengthwise. Place with cut side up on a baking sheet; set aside. In a skillet, saute onion and garlic in oil until tender. Add spinach and stir until heated through, about 1 minute. Remove from the heat. Stir in Parmesan cheese, Italian seasoning and fennel seed; mix well. Spread evenly over bread halves. Sprinkle with tomato, mozzarella and basil. Bake at 400° for 8 to 10 minutes or until cheese is melted. Garnish with parsley if desired. Cut into slices and serve immediately. Yield: 8-10 servings.