Heat oven to 350°F. Spray 13x9-inch (3-quart) glass baking dish with cooking spray. In large bowl, mix sour cream, soup, green chiles and onion. Stir in hash browns. Fold in cubed and shredded cheeses; pour into baking dish.
Bake about 1 hour or until potatoes are tender and mixture is hot and bubbly. Sprinkle with crushed chips; bake 5 to 10 minutes longer or until chips are light golden brown.