Chicken and lemon casserole

Name: Chicken and lemon casserole
Prep time: 10 min
Cook time: 45 min
Total time: 55 min
Cuisine: European
Ingredients: 6 boneless chicken thighs (or 4 chicken breasts, chopped); 1 onion (finely chopped); 2 sticks celery (finely chopped); 2 cloves garlic (finely chopped); 2 large carrots (chopped); 500 ml chicken stock; 1 unwaxed lemon (cut into slices); 200 g green beans; handful fresh chopped parsley; salt and pepper; Frylight; 12 new potatoes (halved, or 6 regular potatoes, chopped into chunks)