Similar principle to a shepherd's or fisherman's pie, but using chicken left from Sunday's roast hence the name. I couldn't be bothered to make mash so I thinly sliced the potato with my mandolin. Mash would work just as well though.
Ingredients (serves 2)
1 leek, sliced
125g mushrooms, sliced
220g cooked chicken
1/2 tsp chopped garlic
400g potato, thinly sliced or mashed
250g milk
5g butter
5g plain flour
1/2 tsp wholegrain mustard
* in a little oil gently fry the leek, mushroom and garlic until softened
* mix with the chopped chicken in a casserole dish
* make a white sauce by combining the milk, butter and flour in a small pan. Bring to the boil, whisking continually, then simmer for a couple of minutes and stir in the mustard
* stir the sauce into the chicken mixture and top with the potato
* bake at 180C for 40 minutes or until the potato is cooked