Creating Creamy Pesto Tortellini Soup is straightforward if you follow these simple steps:

1. Sauté Onions and Garlic: In a large pot, heat the olive oil over medium heat. Add the diced onion and sauté for about 3-4 minutes until softened. Stir in the minced garlic and cook for an additional minute until fragrant.

2. Add Vegetable Broth: Pour in the vegetable broth and bring the mixture to a gentle boil.

3. Cook Tortellini: Add the cheese tortellini to the pot and cook according to the package instructions, usually about 3-5 minutes, until they float to the top.

4. Add Spinach: Stir in the fresh spinach leaves and allow them to wilt in the hot broth for about 2 minutes.

5. Incorporate Cream and Pesto: Reduce the heat to low and stir in the heavy cream and basil pesto, mixing until well combined.

6. Season: Taste the soup and season with salt and pepper as desired.

7. Serve: Ladle the soup into bowls, garnishing with grated Parmesan cheese and fresh basil leaves if desired.

This method ensures a delicious and creamy soup that is simple to prepare.