Heat the oil in a stockpot over medium-high heat. Add the onion and garlic and saute for 5 minutes. Add the sage, tomatoes, broth, and spinach. Bring to a boil, lower the heat, and simmer for 10 minutes. Preheat the oven to 400 degrees. Add the rosemary, basil, and milk to the soup and simmer for 10 minutes. Season with pepper. Spread each slice of bread with oil and Italian seasoning. Toast in the oven for 2 minutes. Top with cheese and continue to bake until the cheese melts, about 2 minutes. Place a bread slice on each serving of soup. | 
