In a sauce pan, stir together milk, flour, salt, pepper and garlic powder. Cook and stir over medium heat until thickened and bubbly. Stir in onion. Spray 8x8 pan with nonstick spray. Place half of the potatoes in the pan. Top with half of the cheese. Repeat layers. Bake covered at 350 degrees for 65 minutes. Cover and let stand for 5 or until cheese melts.
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