Spray a large non-stick casserole dish with low calorie cooking spray. Place over a high heat. Add the chicken pieces and cook until lightly browned on all sides.

Add the onion, celery and garlic, and cook for a few more minutes until softened

Add the carrots, chicken stock, potatoes and lemon slices, season well, cover with a lid, and simmer gently for 30 minutes, being careful not tp let it boil up. If the stock doesn't quite cover the veg then add a little more water so everything's immersed

Mix in the green beans, place the lid on and simmer for a further 5-8 minutes.

Check that the potatoes are cooked through, and serve sprinkled with chopped parsley (remove the lemon slices as you serve)