To prepare a spinach and ricotta puff pastry christmas tree recipe, first you need to prepare the filling. You will need: 1 pound of spinach, 1 cup of shredded cheese, 2 tablespoons of Parmesan cheese and 1 tablespoon of parsley. Preheat the oven to 375 degrees F (190 degrees C). Lightly grease the inside of an 8 by 8-inch (22 by 23-cm) baking dish with non-stick cooking spray. Place the dough in the dish and cover with plastic wrap. Let rise until doubled in size, about 1 hour. Cut the pastry in half lengthwise. Roll each half out to 1 inch (2.5 cm) thick. Brush the tops with melted butter and sprinkle with salt and pepper. Bake for 20 to 25 minutes or until golden brown. Remove from oven and allow to cool before cutting into squares.