spinach, fresh and chopped
tomatillos, coarsely chopped
green chile peppers, chopped
Cook and stir onions in oil in a 3-quart saucepan until tender.
Stir in remaining ingredients except broth and sour cream; Cover and cook over medium heat for 5 minutes, stirring occasionally.
Place mixture in food processor workbowl fitted with steel blade or in a blender container; cover and process until smooth, about 1 minute.
Return mixture to saucepan; stir in broth.
Heat to boiling; reduce heat.
Simmer uncovered for 10 minutes; Stir in sour cream.
Cover and refrigerate any remaining sauce.