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Stir in the flour and 1 teaspoon of salt until the mixture begins to bubble. This creates a roux, a base that will thicken the sauce.
Reduce heat to low and stir in the cheese and mustard until the cheese is completely melted and the sauce is smooth.
Stir in the flour and 1 teaspoon of salt until the mixture begins to bubble. This creates a roux, a base that will thicken the sauce.
Reduce heat to low and stir in the cheese and mustard until the cheese is completely melted and the sauce is smooth.