Preheat oven to 450 degrees F. Line 13x9x2-inch baking pan with Reynolds Wrap® Aluminum Foil.
Combine black beans, corn, tomatoes and onion; season to taste.
Add 1/2 cup chipotle marinade. Spoon into foil-lined pan.
Place chicken breasts on top of vegetables; season to taste. Spoon remaining 1/4 cup chipotle marinade on chicken breasts. Cover pan with a sheet of foil; crimp to seal edges.
Bake 22 to 26 minutes or until chicken registers 170 degrees F. on thermometer. Top with Southwest Dressing and garnish as desired.