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Melt the butter in a saucepot over medium heat. Add the flour. Stir over medium heat for 5 minutes.
Add the milk and increase heat to medium-high. Whisk until it begins to thicken.
Add the cream cheese and cheddar cheese and stir until melted.
Stir in the seasoning and mustard.
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Add in the cooked macaroni noodles and serve.