Place dry white sauce mix in slow cooker. Gradually add water & stir until smooth.
Stir in broth, mushrooms, onion, garlic, basil, oregano, cayenne pepper & salt. Cover and cook on low for 5-6 hours on high for 2-2 1/2 hours. Stir in tortellini. Cover and cook on low for another 1 hour or high for 45 minutes more. Stir in evaporated milk and spinach. Cook for a minute or two more.
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