Stove Top Preparation
Prepare in a heavy cast-iron pan. Cook vegetables as directed; top with cheese. Cover. Remove from heat. Let stand, covered, 5 to 10 min. or until cheese is melted.
Substitute 1 red bell pepper for 1 of the poblano chiles.
Flour tortillas are traditionally served with this dish, which originates in the Northern Mexican state of Chihuahua.