1
Stir in the flour and whisk for 1 to 2 minutes to form a roux. Slowly add the milk while whisking constantly to prevent lumps.
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2
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3
Transfer the mixture to a greased 9×13-inch baking dish. If desired, top with a little extra cheese. Bake in a preheated oven at 350°F for 20 to 25 minutes, until bubbly and the top is lightly golden.
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