Tuscan Pumpkin White Bean Soup

Bahan-bahan (6 porsi)

• 1 medium onion, (coarsely chopped)
• One 15-ounce can unsweetened pumpkin puree
• 3½ cups fat free chicken or vegetable broth
• One 15.25-ounce can white beans, (drained and rinsed)
• ¼ teaspoon ground oregano
• salt and freshly ground black pepper, (to taste)
• 6 tablespoons grated Parmesan cheese