1-Begin: Begin by preheating the oven to 400ºF and lining 2 to 3 baking sheets with parchment paper. Heat the olive oil in a small skillet over medium heat, add the onion, garlic, and chili flakes, and cook for 3 to 4 minutes until softened. Transfer this mix to a bowl and let it cool before adding the spinach, artichokes, and cheeses; season with salt and pepper and stir well.

2-Next: Next, unfold the puff pastry on a lightly floured surface, spread half the filling over it leaving a border, and brush the edge with beaten egg mixed with water. Roll it up carefully, repeat for the second sheet, and chill if needed. Slice into pieces, place on the sheets, apply egg wash, and bake for 25 to 30 minutes, rotating halfway, until golden. Let them cool a bit before serving for the best taste and texture.