Preheat the oven to 190°C/Gas 5. Heat 1 tablespoon oil in a large, wide flameproof casserole or heavy-based saucepan and add the onion, carrot and celery. Cover and sweat over a low heat for 15 minutes, stirring occasionally, until tender.
Meanwhile, cook the mushrooms in 2 or 3 batches. To do so, heat 1 tablespoon oil and a knob of butter in a large, wide frying pan over a medium heat. Add a batch of mushrooms, turn the heat up high and cook, stirring often, to encourage them to release their juices. Continue to cook until most of the juices have evaporated and the mushrooms are starting to caramelise. Add them to the sweated vegetables. Repeat with the remaining mushrooms, adding the garlic and thyme, if using, to the last batch towards the end of cooking.
Pour the wine into the frying pan and let it bubble for a couple
of minutes, stirring to release the tasty bits stuck to the bottom of the pan. Pour over the mushrooms, then add the stock. Bring to a simmer and leave to cook gently while you make the topping.
Sift the flour and salt into a bowl, add the butter and rub in with your fingertips until it resembles coarse breadcrumbs. Stir in the mustard powder and cheese. Beat the egg with the milk, then stir lightly into the flour mix, bringing it together into a very soft, sticky dough (much looser than a conventional scone dough).
Taste the mushroom stew and add more salt and pepper if needed. If you’ve used a saucepan, transfer the stew to a wide oven dish. Drop large spoonfuls of the scone dough on to the mushroom mixture. Bake for about 30 minutes, until the scone topping is well risen and golden. Poke a skewer into one of the ‘cobbles’ to check that it is cooked right through.
Serve the ‘cobbler’ without further ado, with a bowl of soured cream (or yoghurt) for dolloping on top.
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