Place a large saucepan on a low heat and add the butter.
Once melted, add the flour and use a whisk to mix together into a thick paste. Continue to cook for around 30 seconds to one minute, stirring constantly.
Pour in approximately 100ml of the milk and continue stirring until it forms a smooth, thick paste with no lumps.
Continue to add the milk, around 100ml at a time, stirring constantly. Each time, only add the next lot of milk when all the lumps are gone. Once all the milk has been added, you should have a smooth, thick white sauce.
Continue to stir until it starts to bubble, simmer for 30 seconds, then add the cheese, nutmeg and a generous seasoning of salt and pepper.
Mix well until the cheese has melted and you have a smooth sauce, then remove from the heat and serve.
Notes
TOP TIP: Don't rush and add all the milk in one go, this will make the sauce lumpy. Adding it gradually is what stops you getting clumps in the sauce.
Storing: Any leftover gluten free cheese sauce can be portioned into tubs and either refrigerated for up to 5 days or frozen. Reheat before serving.
Reheating: When cooled this bechamel sauce will thick. To reheat, stir well when reheating in a pan (or stir regularly if microwaving) and add a little extra milk if you need to thin it out.
Step-by-Step Photos: Check out the blog post above for step-by-step photos of this method if you find a visual aid helps.
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