Preheat oven to 450°F. Line a half-sheet pan with parchment paper and set aside.
Cut the mozzarella sting cheese into 1-inch pieces and set aside until ready to use.
Roll out pizza dough on a pastry mat or lightly greased surface. Using a ruler and a pizza wheel, cut the dough into 2-inch squares.1
Place a piece of mozzarella cheese on top of a dough square. Then, wrap the dough around the cheese, tightly sealing the edges of the dough. Roll the dough ball in the palm of your hands to make sure it's round and well-sealed.
Place the dough-wrapped cheese ball on the prepared pan. Repeat steps three and four. Place the balls so that they are touching and form the shape of a tree.
To make the egg wash, whisk together the egg and water in a small bowl. Use a silicone basting brush to brush the egg wash over the top of the pull-apart tree.
Bake in 450°F oven for 20 minutes.
Mince the fresh Italian parsley, basil, oregano, rosemary, and thyme. Add them to a small bowl, using a fork to stir them together. Set aside until ready to use.
Remove the pan from the oven. Melt unsalted butter in the microwave and stir in garlic powder. Use a silicone basting brush to brush the top of the pull-apart tree with the garlic butter. Sprinkle half of the parmesan cheese on top. Then, return the pan to the oven for five minutes.
Remove from the oven and sprinkle the minced herbs and red pepper flakes over the top. Top with the remaining parmesan cheese. Serve warm with sides of pizza sauce and garlic butter for dipping.
Yield 24 servings.