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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, cheddar cheese and pepperjack cheese and stir until melted.
Stir in the seasoning, mustard and pimentos. Add in the cooked penne noodles and serve.