Thaw rolls on counter for 10 minutes just until thawed but still cool to the touch. Line a large sheet pan with parchment paper.
On a non-stick surface, press each piece of dough into a 2-circle. Center one piece of mozzarella in the center of the dough. Pull sides of dough together and pinch to seal. Repeat process until all rolls are filled shaping into even rounds.
Arrange rolls seam side down on pan side by side, touching. Begin with 2 rolls side by side to form the base of the tree, then a row of 7 rolls, 6 rolls, 5 rolls, 4 rolls, 3 rolls, 2 rolls and 1 roll for the top row.
To make the star, flatten one roll and cut into a star shape with a cookie cutter, place on top of single roll or place alongside the tree without touching, on the pan. Cover with plastic wrap and let rise in a draft free place for 1 hour.
Bake: Preheat oven to 350°F. In a bowl, stir together melted butter, Italian seasoning, salt, red pepper flakes and minced garlic. Brush rolls on all sides liberally using a pastry brush. Reserve half for after baking. Mix some of the chopped parsley with reserved butter. (Reheat butter for a few seconds in microwave if it solidifies and cools while the rolls bake)
Bake Christmas tree rolls for 20-22 minutes or just until golden brown and puffed. Remove from oven and brush with reserved butter and sprinkle with grated Parmesan cheese and remaining chopped parsley.
Decorate with sprigs of rosemary and cherry tomato halves then serve immediately with warm marinara sauce or pizza sauce for dipping.