Carefully unroll the gluten-free puff pastry sheet on the included parchment paper or a silicone baking mat. (If using Schar Gluten-Free Puff Pastry, do a rough rollout of the puff pastry dough to make it more flexible. See recipe notes).
Use a spatula or knife to spread a thin layer of Nutella on top of the puff pastry sheet.
Roll the long side of the puff pastry to form a log.
Use a sharp knife to score the log, marking where you will slice to create 12 Nutella swirls. Use a piece of thread or unflavored floss to cleanly cut out each slice. Slide the thread under the log and toss both ends of the thread over the log. Pull each end to cleanly slice off a Nutella swirl. Continue until you have 12 slices.
Place each slice on a parchment-lined baking sheet. (If the dough is cracked, you can bake them in a paper-lined muffin tin, which will help the swirls maintain their shape.)
Bake for approximately 14-15 minutes, until golden and puffy. Place the Nutella swirls on a wire rack to cool for approximately 5 minutes before serving.
Notes
Use any storebought or homemade gluten-free puff pastry with a recommended baking temperature of 400℉ or less. I do not recommend Sweet Loren's Puff Pastry for this recipe, as the high baking temperature of 425℉ is not ideal for Nutella. Schar Rough Puff Pastry Rollout:
With wet fingertips, press the dough together to repair any cracks.
Lightly dust your work surface with gluten-free flour.
Fold the sheet of dough into thirds like a letter.
Use a rolling pin to roll the dough into a rectangle.