Preheat oven to 375 degrees F, and line baking sheet with parchment paper.
In a large mixing bowl, combine flour, baking powder, and sea salt, and stir.
Add Greek yogurt and stir until a dough forms. If it's too dry add a little bit of water at a time until everything comes together. The dough should be slightly sticky.
Lightly flour the countertop or place a parchment paper down, then transfer the dough on top, then use a rolling pin to roll the dough into a rectangle about 11x16 inches.
Use a sharp knife to cut a Christmas tree: cut a long triangle with the dough from the bottom corners to the top center.
Carefully remove the excess dough from the sides (2 thinner triangles) and use a spatula to transfer to the parchment lined baking sheet. Line them next each other so they are roughly the same shape as the large Christmas tree triangle and pinch together. This will be the bottom layer.
Stir together butter, parmesan, garlic, parsley, and sea salt until a paste forms.
Reserve 2 tbsp and spread the mixture evenly all over the pastry sheet. Sprinkle evenly with mozzarella cheese.
Place the big triangle on top, lining up the corners so they match. You can work the dough with your hands if there are any cracks while stretching.
Cut 1-inch wide strips on either side of the "tree" leaving the center "trunk" intact. Take each cut strip and twist all in the same direction. It's okay if the dough rips slightly, just smooth them with your fingers.
Melt the remaining 2 tablespoons of the garlic butter in the microwave, and brush on top of the tree.
Brush again with egg wash.
Bake for 25-30 minutes until golden brown, and serve with marinara sauce.