In a large mixing bowl, combine the warm milk and sugar. Sprinkle the instant yeast over the top and let it sit for about 5 minutes until it becomes frothy.
Add the olive oil, flour, and salt to the yeast mixture, and stir to combine. Knead the dough on a lightly floured surface for about 5-7 minutes until smooth and elastic.
Place the dough in a lightly greased bowl, cover it with a damp cloth, and let it rise in a warm place for 1 hour, or until it doubles in size.
Once risen, punch down the dough and roll it out on a floured surface to about a 12x12 inch square.
Sprinkle garlic powder and Italian seasoning evenly over the dough, then layer the mozzarella and cheddar cheese on top.
Cut the dough into triangles by slicing diagonally to create a tree shape with the large base and smaller triangles towards the top.
Carefully stack the dough triangles on top of each other, starting from the bottom. Position the triangles in a star-like formation on a baking sheet lined with parchment paper, shaping them into a Christmas tree.
Preheat the oven to 375°F (190°C).
Beat an egg in a small bowl and brush it over the top of the tree for a golden finish.
Bake in the preheated oven for 20-25 minutes, or until golden brown and the cheese is melted.
Remove from the oven and garnish with chopped fresh parsley for a festive touch.
Notes
Serve warm directly on the baking sheet, adorned with additional sprigs of parsley for a festive touch.