PLACE tomatillos and chiles in shallow pan; brush with oil. Broil, 6 inches from heat, 15 min. or until blackened. Meanwhile, cook patties as directed on package. Chop coarsely.
TRANSFER tomatillos and chiles to blender. Add broth; blend until pureed. Pour into large saucepan. Stir in chopped patties, chickpeas and tomatoes.
BRING to boil; simmer on medium-low heat 15 min., stirring occasionally. Serve topped with avocados and cilantro.