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Heat butter in a medium saucepan until melted.
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Add flour, stirring until smooth.
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Cook gently over medium heat until light golden brown, 6-7 minutes.
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Meanwhile, heat the milk in a separate pan until almost boiling.
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Add milk to the butter mixture 1 cup at a time, whisking continuously until very smooth.
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If lumps begin to form, you need to adjust the heat up a bit higher.
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Bring to a boil, and cook for 30 seconds, continuing to stir.
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Remove from the heat and season with salt and nutmeg.
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Note: After I had brought it to a boil and let it cook for 30 seconds, it was still too liquidy.
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I continued to cook it over high heat, stirring constantly, until it thickened down, and began to coat the back of the spoon.