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Put the potatoes in a saucepan and cover with cold water. Crumble in the stock cube. Bring to the boil and cook until almost fully cooked (i.e. yield to the point of a knife with a little resistance). Drain well but reserve the stock .
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Heat the oil and soften the leeks.
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Add in the chicken and brown on both sides.
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Add in the bay leaves, garlic and cook for a minute until fragrant.
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Add in the drained potatoes and enough stock to come half way up the chicken and potatoes. Tuck in the cabbage.
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Partially cover and reduce heat to a simmer an cook until the chicken is tender and starts to flake (about 10-15 minutes on low-medium heat).
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Take off the lid and mix the cream and mustard together, then stir into the chicken.
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Turn the heat up and if necessary, slake the cornflour with 1 tbsp cold water and add to the pan also, turning up the heat briefly to thicken the sauce.
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Taste and season with salt and pepper as needed.