Preheat oven to 375F. Line the baking sheet with parchment paper.
In a medium bowl add spinach, red pepper, artichoke hearts, ricotta cheese, minced garlic, salt, chili flakes, and pepper. Mix well to combine
Roll the dough into about 12" x 8" thin rectangular sheet
Spread the ricotta mixture evenly on the dough sheet.
Then roll up the sheet to form swirls of the ricotta-spinach mixture.
Carefully cut the roll into 1/2"-3/4" slices. Arrange these slices on the lined baking sheet into a Christmas tree shape
Bake for about 20 minutes or until well done
Sprinkle some finely grated parmesan cheese and serve warm