i used the Annabel Karmel one....you could NOT be a worse cook than me, so if i can make it, you certainly can....& i'm bad...i'm talking "i can burn a cup of tea" bad here!!!!!
here's the recipe:
15g/half oz unsalted butter
1 tblsp plain flour
150 ml/ 5fl oz milk
50g/2oz grated cheese (cheddar/edam/gruyere)
Melt hte butter over a low heat in a saucepan & stir in the flour to make a smooth paste.Whisk in the mik & stir until thickened. Take the saucepan off the heat & stir in the grated cheese. Keep stirring until all the cheese has melted & the sauce is smooth.
I froze it in 1oz cubes & i'll add it to different meals as i need it!good luck!!!