This is super easy and freezes really well so its great for batch cooking...
method
Cut your chicken thighs in half and dust with seasoned flour, pre-heat a large cast iron casserole pot (use a large pan if you don't have a cast iron pot) and add a glug of olive oil, gently fry your chicken thighs until golden then remove with a slotted spoon and set aside
Lower the heat and add another glug of oil then add the leeks, carrots and chopped onion and cook for a few minutes then add the apples, stock, cider, tarragon and chicken bring up to the boil, cover and lower the heat, then simmer for 40-45 minutes until the chicken is cooked.
Serve as a one pot for all the family or freeze into portions and enjoy at a later date...