1. Cut corn kernels from cobs; set kernels aside. Discard cobs. In a small saucepan bring 1 cup of lightly salted water to boiling. Add lima beans and simmer about 15 minutes or until tender. Remove with a slotted spoon; set aside. Add corn to saucepan. Simmer about 3 minutes or until tender; drain. Set aside.
2. For dressing, in a blender combine buttermilk, avocado, parsley, salt, onion powder, dry mustard, pepper, and garlic. Cover and blend until smooth. Pour into a small pitcher.
3. Line a large platter or four serving plates with the lettuce. Arrange chicken, crumbled bacon, corn, lima beans, onion, and cheese in rows on lettuce. Serve with dressing.
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