Pre Heat oven to 400 F. Line 2 baking sheets with parchment paper. Slice and saute mushrooms in a skillet until lightly golden in color. Set aside and let cool.

Unwrap each puff pastry onto a board. Brush each with egg wash and then sprinkle all over with some of the grated parmesan cheese. Lay down the Ham, then the cheese and then the cooled mushrooms. Roll up tightly and seal with more egg wash. Refrigerate and let chill for 5 minutes to firm up the dough.

Remove the chilled dough, slice into 1/2" rounds and place on the lined baking sheets. Aprox. 10 slices per sheet. Brush the tops with more egg wash, evenly sprinkle with the remaining parmesan cheese and bake in the oven until golden brown and cheese becomes bubbly. Aprox. 20-25 minutes. Alternate the pans halfway through.

Let cook slightly, remove from parchment and serve warm.