STEP 1

Heat 1/2 tbsp oil over a gentle heat in a flameproof casserole dish. Add the onion and cook for 5 mins until softening. Scatter over the thyme and garlic, and stir for 1 min. Turn up the heat and add the chicken, frying until golden but not fully cooked. Add the mushrooms and the remaining oil. Heat oven to 200C/180 fan/gas 6.