Melt the butter in a small saucepan over medium heat. Whisk in the flour and cook for 1 minute without browning. Slowly whisk in the warm milk. Raise the heat to high and continue whisking until the sauce begins to thicken and the raw taste of the flour has been cooked out, about 5 minutes. Season with 1 tsp salt and 1/4 tsp pepper.
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