Chicken bastilla

Name: Chicken bastilla
Ingredients: 1 tbsp olive oil; 4–6 large chicken thighs (around 750g/1lb 10oz), boneless; 10g/½oz butter; 2 onions, finely chopped; 2 garlic cloves, finely chopped; 1 tsp ground ginger; ½ tsp ground cinnamon; ½ tsp ground turmeric; pinch of saffron; 500ml/18fl oz chicken stock or water; 3 large free-range eggs, beaten; 75g/2½oz ground almonds or pistachios; 75g/2½oz dried dates, finely chopped; 1 tbsp orange blossom water; 1 tsp finely grated orange zest; 4 tbsp finely chopped fresh parsley; 30g/1oz butter, melted; 6 large sheets filo pastry; 1 egg, beaten, to glaze; salt and freshly ground black pepper; 1 tbsp icing sugar, to garnish; pinch of ground cinnamon, to garnish