In a medium saucepan, melt the butter over medium heat. Don’t let it brown, just melt it until it starts to bubble lightly.
Add the flour and whisk right away. Keep whisking for about a minute to cook out the raw flour taste. The mixture should look smooth and slightly thick.
Pour in the milk all at once and whisk immediately. Keep whisking until smooth, then let it cook for about 5 to 7 minutes until it thickens and coats the back of a spoon.Season with salt, pepper, and a pinch of nutmeg. Mix for a few seconds and turn off the heat. If you like, add about a tablespoon of grated parmesan for extra flavor and whisk it in.
Notes
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