Brown the chicken: Heat your oil in a large frying pan or saucepan and add the chicken. Cook for about 5-10 minutes until just starting to turn brown.
Veggies in to soften: Add in the mushrooms, garlic and onion and cook for a further 5 minutes until they start to soften.
Finish off the creamy filling: Add the flour and thyme and stir through everything, cook for 5 minutes.
Gradually add the stock, milk and mustard, stirring until the sauce is smooth. Season well, then leave to bubble away and thicken for about 10 minutes.
Leave to cool: Spoon into a pie dish and leave to cool for at least 30 minutes.
Pastry lid goes on: Smooth the pastry over the top of the filling. Decorate the pie with cut out shapes if you feel that way inclined and brush with the beaten egg. Cut a slit into the pastry as a steam vent.
Time to bake: When you are ready to bake the pie, preheat the oven to 200°C fan/220°C/425°F/Gas Mark 7 and bake for about 30-35 minutes until the filling is hot throughout and the pastry is crisp and golden.
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Calories: 671kcal | Carbohydrates: 45g | Protein: 29g | Fat: 42g | Saturated Fat: 11g | Polyunsaturated Fat: 7g | Monounsaturated Fat: 21g | Trans Fat: 0.1g | Cholesterol: 134mg | Sodium: 346mg | Potassium: 797mg | Fiber: 2g | Sugar: 5g | Vitamin A: 222IU | Vitamin C: 2mg | Calcium: 101mg | Iron: 4mg