01 -
Combine pumpkin purée, brown sugar, cinnamon, nutmeg, and salt in a medium bowl. Stir until smooth and evenly blended.
02 -
On a lightly floured surface, gently roll the thawed puff pastry sheet to smooth creases and slightly enlarge the surface area.
03 -
Evenly spread the pumpkin mixture over the pastry, leaving a ½-inch border along one long edge. Sprinkle shredded Gruyère cheese over the filling.
04 -
Starting from the side opposite the border, tightly roll the pastry into a log. Seal the edge using a small amount of water if necessary to secure the seam.
05 -
Wrap the rolled pastry log in plastic wrap and refrigerate for 20 to 30 minutes to firm up for easier slicing and better shape retention during baking.
06 -
Preheat oven to 400°F. Unwrap the chilled pastry log and slice into ½-inch-thick rounds using a serrated knife.
07 -
Place the pinwheel slices cut-side up on a parchment-lined baking sheet, spacing about 1 inch apart.
08 -
Brush beaten egg over pinwheel tops to enhance golden color and shine. Bake for 15 to 18 minutes until puffed and deeply golden.
09 -
Allow pinwheels to cool on the baking sheet for several minutes before transferring to a serving platter. Serve warm.