Preheat the grill for high heat.
Lightly oil the grill grate. Place chicken on the grill, and cook 6 minutes per side, or until juices run clear. Remove from heat, cool, and slice.
In a large bowl, mix the red leaf lettuce, green leaf lettuce, tomato, cilantro, corn, and black beans. Top with the grilled chicken slices and French fried onions.
In a small bowl, mix the Ranch dressing and barbeque sauce. Serve on the side as a dipping sauce, or toss with the salad to coat.
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