Classic French Macaroni and Cheese

Method

1. Preheat oven to 180°C (350°F).
2. Cook macaroni according to package instructions, then drain.
3. In a saucepan, melt butter over medium heat, add flour, and cook for 1 minute.
4. Gradually add milk, stirring constantly until thickened.
5. Stir in cheeses, salt, pepper, and mustard until melted and smooth.
6. Combine macaroni with the cheese sauce, transfer to a baking dish.
7. Bake for 20-25 minutes until golden and bubbly.