Preheat oven to 350 degrees. Combine mashed potatoes, sour cream, milk and garlic powder in large bowl; mix well. Spoon half the mixture into 2 qt. baking dish. Sprinkle with 2/3 c. fried onions and 1/2 c. cheese. Top with remaining potato mixture. Bake 30 minutes until hot. Top with remaining onions and cheese. Bake 5 minutes until onions are golden.
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