Melt 2 tablespoons butter in a saucepan over medium heat
Add 2 tablespoons all-purpose flour
Whisk constantly for 1 to 2 minutes to form a smooth paste
Gradually pour in 1 cup milk while whisking
Continue whisking until the sauce is smooth and begins to thicken
Cook for 2 to 5 minutes, stirring constantly
Season with salt and pepper to taste
Remove from heat when the sauce reaches the desired consistency