Pic of Mushroom, chestnut and thyme casserole with mashed potato

Mushroom, chestnut and thyme casserole with mashed potato

Show ingredients

Vegetarian mains

Mushroom, chestnut and thyme casserole with mashed potato

Main Serves 2 50 min
This vegan recipe uses the nutty sweetness of cooked chestnuts with mushrooms in a hearty casserole, with red wine and thyme. Served alongside miso mash (the miso adds extra umami (savoury) flavour), this is seriously good comfort food! Add greens of choice for a dash of colour.

Cook's notes

We thoroughly recommend getting hold of a potato ricer, they make the smoothest mash with little effort, and aren't too expensive to buy. It's fine to use a potato masher, of course, but don't be too over zealous with it, as you can overwork the mash, making it gloopy.


  • 1 red onion, peeled & thinly sliced
  • 2 garlic cloves, peeled & finely chopped
  • 15g thyme, leaves picked off the stalk
  • 400g mushrooms, quartered
  • 1 pack cooked chestnuts
  • 1½ tsp cornflour
  • 1 tbsp tomato purée
  • 100ml red wine
  • 1 tbsp Worcester sauce
  • ½ tbsp bouillon powder
  • 500g potatoes, peeled & diced into 2-3cm chunks
  • 15g parsley, chopped
  • 2 tbsp white miso paste (optional)
Image of Mushroom, chestnut and thyme casserole with mashed potato


Prep time: 15 min
Cooking time: 35 min
  • Step 1

    Preheat your oven to 180˚C/Gas 4.
  • Step 2

    Heat 2 tbsp of oil in a flameproof and ovenproof casserole, one with a lid. Gently fry the onion for 8 minutes, stirring often, until softened.
  • Step 3

    After 8 minutes, add the garlic, thyme, mushrooms, cornflour and 1 tbsp of oil to the onion. Increase the heat slightly. Stir-fry for 2-3 minutes, to soften the mushrooms slightly.
  • Step 4

    Stir in the tomato purée, wine, Worcester sauce, bouillon and 300ml of water. Stir in the chestnuts and season. Bring to the boil. Cover and bake for 30 minutes. Check and stir towards the end; add a splash more water if needed.
  • Step 5

    Put the potatoes in a pan of cold, salted water. Boil for 10-12 minutes, until soft.
  • Step 6

    When cooked, drain the potatoes. Leave in the colander for 2 minutes to steam, then mash in the same pan with the miso (if using) and some olive oil to loosen if needed. Season.
  • Step 7

    Stir most of the parsley into the casserole. Check the seasoning. Divide the casserole between 2 bowls. Sprinkle with remaining parsley and serve with the mash.

You may also like…