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Preheat the oven to 350F. Wrap the flour tortillas in foil and get them warm.
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In a large bowl, whisk together the cream of chicken soup with the 2 cups of sour cream. Add the finely chopped onion, diced roasted chilies and the sliced black olives. Fold in the cooked chicken and season this mixture with the kosher salt and black pepper.
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In a separate bowl, mix the 2 cheeses together. Add half of the mixed cheeses to the chicken mixture.