Preheat your oven to 400°F (200°C) to ensure it reaches the perfect temperature for baking the palmiers.

On a lightly floured surface, roll out the puff pastry sheet to smooth out any creases and make it ready for toppings.

Using a brush, evenly coat the surface of the pastry with melted butter to help the sugar and cinnamon adhere and to add richness.

Sprinkle the sugar and ground cinnamon mixture evenly over the buttered pastry to infuse sweet and warm flavors.

Fold the sides of the pastry towards the center so both edges meet in the middle, then tightly roll the pastry in from both ends toward the center to form a double roll.

Cut the rolled pastry into slices approximately ½ inch thick to create individual palmiers.

Place the sliced palmiers cut-side up on a baking sheet lined with parchment paper, spaced apart to allow for expansion.

Bake in the preheated oven for 15-20 minutes or until the palmiers turn a gorgeous golden brown and become crispy.

Remove from the oven and let the palmiers cool completely to set their shape and texture before serving.