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Put the veg and chicken in a slow cooker. Pour the stock over and around the chicken thighs, then mix in the gravy granules to thicken it up (the sauce will be quite thick – use less gravy if you prefer a runnier casserole).
Switch the slow cooker to low and leave to cook for at least 4 hrs, or up to 8 hrs – try putting it on before you go to work, so that it’s ready when you get home. Season well, then serve.