Preheat Oven: Preheat your oven to 200°C (390°F). Line a baking sheet with parchment paper and set aside.
Prepare Pumpkin: First, remove the skin and seeds of the pumpkin. Then, cut the pumpkin into small chunks.
Cook Pumpkin: Place chopped pumpkin on a baking pan. Drizzle with the olive oil and toss to coat. Roast for 25-30 minutes or until tender. Remove and allow to cool for 20 minutes.
Prepare Filling: While the pumpkin cools, thaw the pastry. In a high-speed food processor, combine cooled pumpkin, spinach, Italian seasoning, and season with salt and pepper. Blend until mostly smooth with some small chunks remaining.
Assemble: On a large chopping board, lay out one sheet of thawed pastry. Spread half of the pumpkin mixture evenly to the edges. Sprinkle half of the crumbled feta over the top.
Roll and Cut: Roll the pastry tightly from one edge to form a log. Slice into pinwheels about 1-inch (2cm-3cm) wide. Place on the prepared baking sheet.
Repeat: Repeat the filling and rolling process with the second sheet of pastry.
Bake: Bake for 25-35 minutes or until the pinwheels are puffed and golden.
Serve: Enjoy straight from the oven!