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Preheat oven to 350
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Add potatoes, soup, sour cream, onion, sausage and 3/4 of the cheese in a mixing bowl and stir until combined
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Transfer to a casserole dish coated with cooking spray
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Top with remaining cheddar cheese
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Bake for 1 hour and 20 minutes or until top is golden brown and bubbly
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Let cool for 10 - 15 minutes before serving