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Cook tortellini per package directions; drain and set aside (do not rinse)
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Heat oil in a large saucepan over medium heat. Add minced garlic and onion. Cook for 3-5 minutes or until it becomes fragrant and onion begins to get translucent.
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Add undrained tomatoes, basil, spinach, salt and pepper.
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Add the drained tortellini and stir to combine.
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Mix the milk and cream; add the flour, blending so there are no lumps—I put this in a covered container and shake it.
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Add the milk mixture and the cheese. Stir constantly until sauce begins to boil.
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Reduce heat and simmer for 5 minutes.
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Serve immediately.