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Preheat the oven to 375°F.
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In a medium saucepan, melt 1/4 cup butter.
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Quickly whisk in flour until a roux (paste) is formed.
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Heat milk in a small saucepan (or in the microwave to save time!).
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Slowly add heated milk (and make sure it's fully warmed first) to the roux, whisking and simmering.
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Add shredded cheese, whisking and simmering until thickened, approximately 10 minutes.
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Add salt to taste.
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While thickening cheese sauce, use a small skillet to melt 2 Tablespoons butter.
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Brown panko crumbs in melted butter, browning 30 seconds to 1 minute on medium high, set aside.
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Place cooked macaroni noodles in a casserole dish or 12 inch cast iron skillet.
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Pour cheese sauce over noodles.
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In a small bowl, mix chicken and barbecue sauce.
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Mix BBQ chicken into the noodles and cheese.
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Top with browned panko crumbs.
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Bake approximately 35 minutes, until cheese is bubbly and top is browned.
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Allow to cool for approximately 5 minutes.
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Garnish with green onions and additional barbecue chicken or barbecue sauce, if desired
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Serve and enjoy!