Macaroni Cheese

1 large onion, diced
4 rashers bacon, diced
125g butter
90g flour
1 tsp onion stock powder
100g grated cheese
3 c milk
500g macaroni
Microwave onion and bacon in 1 extra T butter for 2-4 minutes. Melt butter, add flour and onion stock, and stir. Add milk, slowly bring to simmer, allow to thicken. Add onion, bacon and cheese. Cook macaroni according to packet directions, drain and add to sauce.