Preheat oven to 350°; spray 13 x 9-inch baking dish with cooking spray.
In large bowl, toss meatballs, beans, tomatoes with their juice, chiles, onion, corn, pasta sauce and chili powder; spread in prepared dish and cover tightly with aluminum foil. Bake casserole 40 minutes; remove foil. Sprinkle casserole with cheeses; bake 15 minutes or until cheese is melted and internal temperature of meatballs reaches 160°. Makes about 10 cups.
Serve casserole topped with sour cream, lettuce, olives, avocado and cilantro.
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