Vegan Leek and Mushroom Pie

Name: Vegan Leek and Mushroom Pie
Prep time: 20 min
Cook time: 40 min
Total time: 1 h
Cuisine: British
Ingredients: 2 medium leeks (around 350g); 3 cloves of garlic (crushed); 500 g chestnut mushrooms; 1 teaspoon thyme; 2 pinches of nutmeg powder; 280 g vegan chicken pieces (quorn pieces); 2 tablespoon nutritional yeast; 400 ml plant-based milk; 2 tablespoon flour; 400 g vegan puff pastry block