Combine 2 tablespoons Mrs. Dash Seasoning Mix, with mayonnaise, sour cream, 2 tablespoons lime juice, water and cilantro; set aside. Toss remaining Seasoning Mix with chicken and remaining 2 tablespoons lime juice. Heat oil in a 12-inch skillet and cook chicken over medium-high heat in batches, until browned and thoroughly cooked. Serve chicken over greens and top with tomatoes, beans and avocado, drizzle with sour cream mixture.