Preheat oven to 375°F. Line a large baking sheet with parchment.
Separate the biscuits and flatten each into a 3-inch round. Place 2 tbsp mozzarella in the center of each, pinch the dough closed, and roll into a ball.
Arrange the balls seam-down in a Christmas tree shape on the sheet (rows of 1, 2, 3, 4, then a 2-ball trunk), using any extra balls as ornaments around the base.
Stir the garlic and Italian seasoning into the melted butter and drizzle over the tree. Sprinkle with the Parmesan.
Bake 20–25 minutes until deep golden and cooked through.
Serve warm with the warmed marinara for dipping!