Directions

1. Cook the macaroni as per instructions, drain and set aside
2. fry the bacon adding the onions and mushrooms for the last few minutes and set aside
3. melt butter over medium heat in a large saucepan
4. add the flour and stir to form a roux, cooking for a few minutes
5. gradually whisk in the milk, a little at a time. cook for 10-15min until you have a smooth thickened sauce
6. meanwhile preheat oven to hot
7. remove the sauce from the hob, add 175g/6oz of the cheese and stir until cheese is well combined and melted
8. add the macaroni, bacon, onions and mushrooms to the sauce and mix well with some pepper
9. transfer to deep suitably sized ovenproof dish
10. sprinkle over crushed crisps and remaining cheese, a few tomato slices for a bit of colour
11. place in oven until cheese melts