- Melt butter with garlic in a saucepan on medium heat. Cook, stirring, for 1 minute or until garlic is fragrant but not browned.
- Add flour and cook, stirring constantly, for 1 minute or until smooth.
- Gradually whisk in milk, mustard and pepper. Cook, stirring constantly, for 5 minutes or until the mixture comes to a boil and thickens.
- Remove from the heat; gradually whisk in cheese until melted. Add pepper to taste.