Slow-cooker sausage casserole

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You can use your favourite type of sausages to make this family-friendly slow-cooker casserole. Serve it over pasta, in baked potatoes or with bread

2 red onions, finely chopped

1 celery stick, finely chopped

1-2tbsp rapeseed oil

4 carrots, cut into fat pieces

12 chipolatas, each halved

1 sweet potato, peeled and cut into chunks