Salmon Wellington __ Festive Special!

Ingredients Recap:
Salmon Wellington
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Salmon fillet - 300 gm
Pepper for seasoning Salmon (1/2 tsp to taste)
Salt for seasoning Salmon (1/2 tsp to taste)

For spinach filling
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Baby spinach 1 bunch without stem(140 gm approx.)
Butter-2 tbsp
Garlic chopped-2 cloves
Onion chopped-1 small
Pepper -1 tsp
Salt - 1/2 tsp
Bread crumbs -3-4 tbsp
Cream cheese- 1/3 cup
Parmesan cheese -1/4 cup

For the wrap
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Puff pastry sheet/sheets
Egg -1 beaten for egg wash