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Prepare elbow pasta according to package directions
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Over medium heat melt butter in a saucepan
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Add flour, mustard, and garlic powder to melted butter and whisk for two minutes
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Slowly add in milk to to pot
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Whisk until smooth (about 10 minutes)
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Remove from heat and add cup and a half of cheese, stirring until melted
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In a three quart baking dish combine pasta and cheese sauce (stir if needed)
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Top with remainder of cheese
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Bake for 25 minutes at 375 degrees