These savory puff pastry triangles are filled with a delicious mixture of spinach, feta cheese, and herbs. The puff pastry is flaky and buttery, while the filling is creamy and flavorful. These triangles are perfect as an appetizer or a light lunch. To make them, simply sauté some spinach with garlic and onion, then mix it with crumbled feta cheese, herbs, and a beaten egg. Cut the puff pastry into triangles, fill them with the spinach mixture, and bake until golden brown and crispy.