Set the oven to 400° F. Season the chicken with salt and pepper and place the chicken in the oven. Roast for 25-30 minutes. Once you remove the chicken, lower the temperature to 350°.
Once the chicken is cooked, use a standup mixer with the paddle attachment or 2 forks to shred the chicken.
In a mixing bowl, mix the soup, petite diced tomatoes, and half the olives. Pour 1/2 cup of the mix in the bottom of a casserole dish. Begin layering as follows:
Add a thin layer of chips, 1/2 of the remaining soup, 1/2 of the chicken, 1/2 of the onion, 1/3 of the cheese, and sour cream. Repeat.
Top with remaining 1/3 of the cheese and the remaining 1/2 of the olives.
Place the casserole dish in the oven and bake for 30 minutes.
Garish with fresh diced tomatoes and sliced green onions.