My husband used to cook this for me we used to joke that it was the only thing he could cook! It always makes me smile when I cook it!
Take all ingredients minus the mashed potato and cook for 15 mins until the sauce has warmed through.
Mix a third of the cheese into the sauce.
Pour into a heatproof dish and top with the mash.
Sprinkle the cheese over the mash then put into the oven on 200c for 10 mins until the cheese is golden brown.
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