Prepare Chicken: If using my recipe, steam or bake the dough whole, then cut into bite-sized chunks. Cook Chicken: Fry in olive oil until golden, set aside. Prepare Mirepoix: Dice carrot, onion, and celery into cubes.
Cook Mirepoix: Sauté with 2 tbsp olive oil, salt, and pepper until soft.
Prepare Mushrooms: Cut into large pieces.
Mince Garlic: Finely mince or use a garlic press.
Cook Mushrooms: Fry on medium-high heat until water evaporates and they begin to brown. Add 1/3 of the garlic, dried herbs, and 2 tbsp olive oil; cook until fragrant.
Make Roux: Add flour to softened vegetables, cook for a minute.
Create Sauce: Slowly add plant-based milk, then nutritional yeast; mix well.
Combine: Mix chicken and mushrooms into the sauce; season to taste.
Assemble Pie: Place filling in a 24x16cm tray, top with puff pastry, brush with soy milk.
Bake: At 180°C (350°F) for 20-25 minutes until golden.
Serve: Let cool slightly, serve with mashed potatoes and peas.