- Melt butter in a saucepan over medium-high heat. Add onion and sauté for a few minutes, until translucent.
- Whisk in flour and heat for 1 to 2 minutes, stirring constantly.
- Whisk in milk, stirring constantly to prevent lumps from forming. Cook over medium-high heat for 7 to 8 minutes, until thickened. Season to taste.
You can season the bechamel sauce as you like. It makes the perfect base for chicken bechamel sauce.