- Preheat the oven to 190°C/Fan 170°C/Gas 5. Grease an ovenproof dish or small roasting tray with oil.
- Heat the oil in a large frying pan. Add the onions, garlic and mushrooms and cook over a medium heat for 5-10 minutes, or until the vegetables are soft and any excess liquid has evaporated. Transfer to a food processor and set aside.
- Roughly chop the herbs and add to the food processor with the chestnuts and bread. Season and blitz until the mixture just comes together.
- Use wet hands to shape the mixture into 12 balls and place in a baking dish. Cook for 30-40 minutes until the stuffing is browned and crisp.
Tips: The stuffing mixture can also be baked as one single dish if preferred; follow the recipe as above but press the mixture into the greased dish instead of rolling into balls in step 4. Bake as above then slice into portions to serve.