01 - Preheat the oven to 400°F. Line a baking sheet with parchment paper and set aside.
02 - Heat olive oil in a skillet over medium heat. Sauté the minced garlic for 30 seconds until fragrant, then add the chopped spinach. Cook for 2 to 3 minutes until wilted. Remove from heat and let the mixture cool slightly.
03 - In a mixing bowl, combine the sautéed spinach with crumbled feta, softened cream cheese, black pepper, and nutmeg. Stir until all ingredients are evenly blended into a uniform mixture.
04 - Roll out the gluten-free puff pastry on a surface lightly dusted with gluten-free flour. Spread the spinach and feta filling evenly across the pastry, leaving a ½-inch border along one long edge to help seal the roll.
05 - Starting from the long side with filling to the edge, gently but firmly roll the pastry into a tight log. Brush the reserved border with beaten egg and press gently to seal the seam.
06 - Using a sharp knife, cut the log into 16 even slices, approximately ¾ inch thick. Arrange each pinwheel cut-side up on the prepared baking sheet, spacing them about 1 inch apart.
07 - Brush the tops of each pinwheel with the remaining beaten egg to ensure a rich golden finish during baking.
08 - Bake for 20 to 25 minutes until the pinwheels are puffed and golden brown on top. Allow to cool for a few minutes on the tray before serving warm or at room temperature.