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In a large pan over medium heat, fry the potatoes in a drizzle of oil or knob of butter until crisp on the outside and soft right through the centre (15-20mins depending on size of potato chunks). Season with a good pinch of salt & pepper, then melt in 1 tbsp butter. Add grated onion and fry for 1 min until it softens slightly. Pop everything in a bowl and allow to cool for a few mins.
To the bowl add cheese, mustard, parsley, cream and a couple of hefty pinches of salt & pepper. Give it a good stir and leave it to one side.
Slice the pastry into 4 equal rectangles. Split your filling into 4 and place to one side of each rectangle. Brush around the edges with egg wash then fold over and push down with your fingers to secure. Using a fork, press down around the outside of each pasty, then clean up with a knife. Slice a few steam holes on the top of each pasty.
Add to a greaseproof baking tray (or use parchment paper) and give them a good brush with more egg wash. Place in the oven at 200C/390F for 15-20mins or until deep golden brown and visibly flaky/crisp. Timings will vary so just be vigilant, puff pastry can go from golden to burnt fairly quickly!