Step 1

Cook the oven chips according to the instructions.

Step 2

Put the cornflour into a small bowl, add a splash of milk and mix until you have a smooth paste.

Step 3

Put the rest of the milk and grated cheese in a saucepan. Heat gently until the cheese has melted.

Step 4

Add the cornstarch mixture, and the mustard, garlic powder and turmeric. Carry on cooking, stirring all the time, and the mixture will thicken.

Step 5

To make a thicker sauce, make a little more cornflour paste in a small bowl and stir in to the pan.  DO NOT add cornflour directly to the hot sauce as it will clump and you will never get the lumps out.

Step 6

The cheese sauce is ready when it is thick and glossy, and coats the back of a spoon. Serve immediately, or if chips need a little longer, reheat when you are ready.

Step 7

Transfer the chips to a serving dish and pour over the cheese sauce. Serve and enjoy!