Preheat oven to 425°F Roll out puff pastry onto a parchment-lined baking sheet In a bowl, mix shredded chicken, cream cheese, Cajun seasoning, and garlic Parmesan seasoning Spread mixture evenly over the pastry, leaving about a 1-inch border Top with chopped spinach and arugula Roll into a loaf and pinch edges to seal Brush with egg wash if desired Bake 20-25 minutes, until golden brown and puffed