This savory puff pastry strudel is filled with mushrooms, onions, and Gruyere cheese. The puff pastry is flaky and buttery, while the filling is earthy and cheesy. To make it, simply sauté some mushrooms and onions, then mix with grated Gruyere cheese and herbs. Spread the mixture on top of the puff pastry, roll up like a jelly roll, and bake until golden brown and crispy.
