Heat olive oil in a pan, add chicken, season with salt and pepper, and add butter.
Slice spring onions, grate nutmeg, tear bay leaves, and add thyme to the pan.
Slice button mushrooms and add to the pan.
Add creme fraiche, flour, mustard, chicken stock, and water to create a creamy sauce.
Roll out puff pastry, place it over the filling, and tuck it in.
Brush pastry with milk or egg, add rosemary, and bake until golden brown.
Serve and enjoy!
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