Heat the oven to 400 degrees. Coat a small (3 to 5 cup) shallow baking dish with nonstick cooking spray. Stir the sour cream, cream cheese, mayonnaise, lime and cumin in a medium bowl until blended. Stir in the green chiles, cilantro and 1 cup of the shredded cheese. Spoon into the baking dish and sprinkle with the remaining 1/2 cup shredded cheese. Bake for 20 to 30 minutes or until lightly browned and bubbly. Serve with your favorite dippers.