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Heat oven to 400°F
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Butter a casserole or 9 x 13 inch baking dish with 1 tablespoon of the butter.
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Cook macaroni until almost tender but still firm, about 2 minutes less than package directions. Drain and rinse under cold water.
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Meanwhile, in a small bowl, combine the bread crumbs, parsley, oil, 1 teaspoon of the salt and the pepper and set aside.
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In a saucepan, over medium heat, melt the butter. Stirring constantly, add the flour and cook for 3 minutes. The mixture will clump together.
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Still stirring constantly, add the milk slowly.
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Cook for 7 minutes. Add the Cheddar and the remaining salt and cook, stirring, until thick and creamy, about 5 minutes.
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Add the macaroni and combine.
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Transfer to the baking dish and top with the bread crumb mixture.
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Bake until golden and bubbling slightly around the edges, about 25 minutes.