Preheat the oven to 375 degrees.

Sprinkle a little flour on top of a sheet of parchment paper.

Unfold one sheet of puff pastry on top of the parchment paper. Using a rolling pin, gently roll out the puff pastry sheet into an 11 X 13 inch rectangle. Gently lift the parchment paper and transfer to a baking sheet.

Spread the pesto sauce on top of the puff pastry sheet being careful not to go too close to the edge.

Unfold the second sheet of puff pastry and place on a lightly floured surface. Roll it out also into an 11 X 13 inch rectangle.

Gently place the second sheet of puff pastry on top of the first sheet of puff pastry that has the pesto sauce. Press gently to seal the two sheets together.

Using a piece of printer paper or parchment paper, cut out a Christmas tree shape to use as a template.

Place the Christmas tree template on top of the puff pastry and using a pizza cutter or a sharp knife, cut out the Christmas tree shape. Reserve the extra pieces.

Now it's time to form and slice the "branches" of the tree. I like to place a ruler down the center of the puff pastry Christmas tree to use as a guide, but it's not necessary.

Starting on one side, make horizontal slices into the sides of the Christmas tree triangle being careful to stop before you reach the center.

Repeat the same process on the other side of the Christmas tree triangle; again being careful to stop before reaching the center. You want to leave a 1 to 2 inch section down the middle of the tree that is not sliced.

Starting at the bottom, twist the branches away from you. Press the edge of the branch firmly into the parchment paper to keep the branch from untwisting.

Continue twisting the branches moving up the tree and then move on to the other side and twist those branches as well.

With the excess puff pastry, use a star cookie cutter and make a star for the top of the tree. You can also cut out more shapes for the excess puff pastry and bake them separately as well.

Brush the entire pastry with the beaten egg.

Bake in the preheated oven until puffy and golden brown, 12 to 15 minutes. Cool slightly before serving.

You can gently slide the Christmas tree pastry on to a serving platter. Or lift the parchment paper off the baking tray and place on top of a serving platter.