Puff pastry with mushrooms and ham: crispy, creamy and irresistible

For the filling:
2 tablespoons. 1 tablespoon olive oil
1 small onion or 1 shallot, finely chopped
500 g mushrooms, cleaned and sliced
150 g smoked ham (or smoked bacon), diced
2 tablespoons of butter
2 tablespoons of flour
360 ml warm milk (whole or semi-skimmed)
50g will be (Emmentaler, Comté, Gruyère or Parmesan)
2 tablespoons chopped fresh parsley
Salt and freshly ground black pepper
A pinch of nutmeg (optional)
To assemble: 1 roll of puff pastry (300-350 g)
1 egg yolk + 1 teaspoon of water for egg wash

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