Chicken, pancetta and mushroom pie | Tesco Real Food

Ingredients

• olive oil
• 100g (3 1/2oz) pancetta cubes
• 1 leek, trimmed and sliced
• 200g (7oz) mushrooms, sliced
• 2 tsp plain flour
• 200ml (1/3pt) cold chicken stock
• 75ml (3fl oz) white wine (optional)
• handful thyme leaves
• 75g (3oz) crème fraîche
• 200g (7oz) cooked chicken breast, cubed or shredded
• 2 x 375g packs ready-rolled shortcrust pastry
• 1 egg, lightly whisked