Melt butter in pan. Add onions and sauté for 10 minutes. Stir in flour and curry powder; cook for 2 minutes.
Add broth, potatoes, carrots, celery, parsley and sage. Reduce heat to low; cover and simmer 10 to 15 minutes.
Add turkey, half-and-half and frozen spinach. Cover and simmer, stirring occasionally until heated through, about 10 minutes.