1 medium onion , thinly sliced 1 medium green bell pepper , 1 - inch pieces 3 boneless skinless chicken breast halves , 2x1 - inch pieces 1 ( 15 ounce ) can garbanzo beans , drained 1 ( 14 ounce ) jar spaghetti sauce 1 ( 8 ounce ) can mushroom stems and pieces , drained
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