Whisk vinegar, shallot, mustard, pepper and salt in a small bowl to combine. Whisk in oil until combined. Place salad greens in a large bowl. Add half of the dressing and toss to coat.
Divide the greens among 4 plates. Arrange equal portions of chicken, egg, tomatoes, cucumber, avocado, bacon and blue cheese (if using) on top of the lettuce. Drizzle the salads with the remaining dressing.
Tips: To poach chicken breasts, place boneless, skinless chicken breasts in a medium skillet or saucepan and add lightly salted water to cover; bring to a boil. Cover, reduce heat to low and simmer gently until chicken is cooked through and no longer pink in the middle, 10 to 15 minutes. To shred the chicken, use two forks to pull it apart into long shreds. To hard-boil eggs, place in a single layer in a saucepan; cover with water. Bring to a simmer over medium-high heat. Reduce heat to low and cook at the barest simmer for 10 minutes. Remove from heat, pour out hot water and fill the pan with a mixture of cold water and ice cubes; let stand until the eggs are completely cooled.
Dry-fry the bacon in a frying pan until it’s crispy. Put in a large bowl. Add about a third of the butter to the pan and fry the mushrooms until browned. Add to the bacon.
Add the rest of the butter to the pan, with the flour, and stir to make a thick paste. Pour in the stock gradually, to make a sauce, and bring to the boil for a minute. Stir in the crème fraîche, parsley and seasoning. Pour into the bowl and add the bacon and mushrooms. Cool. Mix chicken into the sauce and put the filling in the pie dish.
Roll out the pastry, if necessary, to ensure that it fits on top of the dish. Brush water on the dish’s edge, put a strip of pastry around, then lay the pastry top on and seal edges, then trim and decorate. Cut shapes out of the leftover pastry and stick on top with water.
Set the oven to 200°C/400°F/Gas Mark 6 or 200°C. Brush the pastry with beaten egg. Bake for 40 mins until golden.
Recipe from Great British Food Magazine November 2014