Preheat your oven to 200C/400F.
In a pan over medium heat, add in the butter and saute your onion, carrot, celery and garlic until softened. Add in the chilli flakes, smoked paprika and saute for another minute. Add in the tomato paste and cook for 2 minutes. Deglaze with the vodka and let it simmer for 2 minutes to dissipate the sharp alcohol flavour.
Sprinkle over the flour and cook out the flour taste, should take 1-2 minutes. Slowly add in the stock while stirring then add in the heavy cream. Simmer until desired thickness is achieved, adjust consistency to your liking.
Fold in the shredded chicken, parmesan and parsley. Transfer the mixture into a skillet and top with puff pastry squares. Brush the pastry with a beaten egg and bake for 20-25 minutes or until golden brown.