In a small saucepan, over medium-low heat, warm the hot sauce. Stir in the butter and heat until melted. Place the chicken pieces in a large bowl, pour the hot sauce mixture over the chicken, and toss. In a small bowl, combine the sour cream, blue cheese, salt, pepper, and 2 1/2 tablespoons water. (If you prefer a thinner dressing, add more water, 1 teaspoon at a time.) Divide the chicken and lettuce among individual plates. Drizzle the blue cheese dressing over the lettuce.
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