Roll out Puff Pastry (or defrost completely if frozen) lightly roll to smooth out. Spread with cream cheese mousse and top with salami slices, then slice into 9 or 10 strips lengthwise.
Fold the strips of dough accordion style, start with a small amount and widen as you go (until you reach the end).
Place a long skewer in the center starting at the base then through to the top of the tree. Place on a parchment paper lined cookie sheet.
Refrigerate for 20-30 minutes. While strips are in the fridge pre-heat oven to 350°.
Remove from fridge and bake for approximately 15 minutes or until golden. If desired top each tree with a green olive and stick into a hard square of cheese or serve as is. Enjoy!