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Preheat your oven to 400°F. In a mixing bowl, combine the sliced potatoes, melted butter, and salt. Layer this mixture at the base and along the sides of a 13×9 inch baking dish. Bake for 25-30 minutes, or until the potatoes are nearly tender.
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As the potatoes bake, brown the ground beef in a skillet over medium heat. Once cooked through, drain any excess fat. Evenly layer the beef and corn over the baked potatoes. In a separate bowl, mix together the cream soup, milk, garlic powder, pepper, onion, and half of the shredded cheese. Pour this mixture over the beef.
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Return to the oven and bake, uncovered, for an additional 20 minutes, or until the casserole has heated through and the veggies are tender. For a golden finish, sprinkle the remaining cheese on top and bake for an extra 2-3 minutes. Garnish with minced parsley, if you prefer.
