My go to cheese sauce

Quite simply this is my go to cheese sauce .. perfect for using in lasagne, my alternate linguine carbonara or any dish that requires a cheese sauce

You will need:

3 level tbsp plain flour
4 tbsp butter
50 grated cheddar cheese 

100g red Leicester cheese 
2 dairylea cheese slices
1 tsp ground black pepper
1tsp onion salt
1 tsp garlic powder
1/2 litre whole milk

• In a medium sized pan, melt the butter on a low heat. Add in the flour & stir till combined and you have a smooth, slightly thick  paste.

• Cook the flour for 2-3 minutes then pour in the milk, and turn up the heat to medium.

• Whisk the milk until the flour has combined and there are no lumps. Leave the heat on meduim and add all the rest of the ingredients.Continue to whisk until all the ingredients have combined.

• Leave to simmer for a few minutes till you end up with a semi thick sauce, check the seasoning of onion salt & pepper & adjust if need be. Leave to cool and it will thicken up slightly more & if need be add a little more milk and whisk once again to thin as you need just before using