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Heat the olive oil in a 5 quart (or larger) dutch oven over medium-high heat.
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Add onion and sauté until soft, approximately 4 minutes.
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Add garlic and sauté an additional minute.
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Add the sausage, and cook until no pink remains and sausage is fully broken up.
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Turn the heat to high and add the broth, crushed tomatoes, basil, Italian seasoning, black pepper, and red pepper flakes.
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Bring soup to a boil, cover, and then simmer for 30 minutes.
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Add Neufchatel cheese, stirring until cheese has dissolved.
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Add spinach and tortellini, cover, and cook for another 10 minutes.
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Check to ensure tortellini is fully cooked, if it is, ladle into bowls and serve.