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Preheat the oven to 350°F (175°C). Grease a 9×13-inch baking dish.
In a medium saucepan, melt the butter over medium heat. Stir in the flour and cook for 1-2 minutes to form a roux.
Gradually whisk in the milk, cooking until the mixture thickens and is smooth.
Combine the cooked macaroni with the cheese sauce and mix well.
Transfer the mixture to the prepared baking dish. If using, sprinkle breadcrumbs on top.
Enjoy!
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