Preheat the oven to 350 degrees.
Melt butter in a saucepan. Add shallots and wine. Reduce over medium heat until wine is almost evaporated. Stir in the flour and cook over medium heat for 5 minutes. Pour the milk in the roux. Whisk and heat until the sauce thickens and comes to a boil. Season with pepper and nutmeg.
Mix in the chopped salmon and the mushrooms sauteed in butter. Stir in the egg yolks.
Whip egg whites until medium stiff. Fold into the salmon mixture. Butter and flour a 7 inch (17.5 cm) round souffle mold.
Spoon the souffle mix into mold.
Bake 30 minutes at 350 F.(180 C). Serve immediately.