To begin, preheat your oven to 400℉. If your puff pastry sheets come frozen, go ahead and set them on the counter to defrost.
On a parchment-lined cutting board, roll out one sheet of puff pastry.
Spread the pesto, then the pizza sauce onto the dough in thin layers.
Add the smoked gouda slices and the sliced pepperoni, then top everything with the second sheet of puff pastry.
Using a pizza cutter wheel, cut horizontally to create 12 slices that are about 1 inch wide. See the picture instructions above for guidance.
Fold each slice on top of each other, creating a Christmas tree shape. You want to have the longest fold on the bottom, and make each fold smaller as you get to the top of the "tree".I have a video that shows this in more detail on my social media accounts - @coinedcuisine Take a wooden skewer and stick it in the middle, vertically, of the pastry shapes.
Place these on a parchment-lined baking tray, leaving space between them to allow for expansion.
Next, whisk one egg in a bowl to create an egg wash. Brush egg wash onto all of your pastries.
Bake for 20-22 minutes, until golden brown and puffy.
Combine the melted butter, fresh parsley, and garlic powder. Brush the garlic butter onto each warm pastry.
Top with shredded parmesan and any extra chopped parsley for presentation. Serve with extra pizza sauce and enjoy!