Open and drain the can of crushed tomatoes. Open, drain and rinse the cans of cannellini beans.
Chop the white onion.
In a large saucepan, add the olive oil and saute the chopped onion for 2 to 3 minutes, then add the minced garlic and saute for 1 more minute. Stir in the chopped spinach, crushed tomatoes, tomato paste, cannellini beans and chicken stock. Bring to bubbling.
Once bubbling, add the tortellini and cook for 3 to 5 minutes, stirring once. Remove from heat immediately and serve. Season with salt and pepper to taste.
Prepare the salad.
Serve White Bean Tortellini Soup with Parmesan cheese garnish and salad.