Spicy Southwest Chicken Salad

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1/2 cup Wish-Bone® Italian Dressing, divided

1/4 tsp. ground chipotle chile pepper

1 lb. boneless, skinless chicken breast halves

1 small onion, cut into 1/2-inch-thick slices

8 cups spring salad mix

1 can (15 oz.) black beans, rinsed and drained

1 medium mango, cut into bite-size pieces

1 medium avocado, cut into bite-size pieces