OPTION 1:
Put a large saucepan of salted water on to boil and cook the potatoes for 10 minutes. Add the carrots and cabbage and cook for a further 5 minutes.
Preheat the GRILL to medium.
When the potatoes and the vegetables are cooked through (check by prodding a potato with a knife), drain well and return to the saucepan.
Then put the saucepan with the vegetables in (with no water in) back onto the hob heat for 1 minute. (This just allows the water to be removed from the potatoes so they aren't watery when we mash them.)
Mash everything well with the butter and salt and pepper.
Use the oil to grease a grill proof dish or tin and pile the mash in. Sprinkle on the cheese and put under the grill until golden (about 3-5 minutes).
OPTION 2 (if you're using leftovers):
Preheat the oven to 200C/400F.
Take all of your cooked, cold potatoes and vegetables and mash well together with butter and salt and pepper. Sprinkle with cheese.
Put into the preheated oven and bake for about 30 minutes until hot through (check the middle is hot inside).
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Calories: 406kcal | Carbohydrates: 54g | Protein: 9g | Fat: 18g | Saturated Fat: 9g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 7g | Trans Fat: 0.4g | Cholesterol: 39mg | Sodium: 247mg | Potassium: 1392mg | Fiber: 8g | Sugar: 7g | Vitamin A: 17179IU | Vitamin C: 56mg | Calcium: 155mg | Iron: 2mg