01 - Preheat the oven to 400°F (200°C). Line a baking tray with parchment paper.
02 - Heat olive oil in a skillet over medium heat. Sauté garlic for 30 seconds, add chopped spinach, and cook until wilted, about 2 to 3 minutes. Remove from heat and let cool slightly.
03 - In a mixing bowl, combine the cooked spinach with crumbled feta, softened cream cheese, black pepper, and nutmeg. Stir until evenly blended.
04 - Roll out the gluten-free puff pastry on a surface lightly dusted with gluten-free flour. Evenly spread the spinach and feta mixture over the pastry, leaving a 1/2-inch border along one edge.
05 - Starting from the longer side, gently roll the pastry into a tight log. Seal the edge by brushing with a little beaten egg.
06 - Slice the log into 16 even pieces. Place each pinwheel cut side up on the prepared baking tray.
07 - Brush the tops of each pinwheel with the remaining beaten egg for a golden finish.
08 - Bake for 20 to 25 minutes until the pinwheels are golden and puffed. Cool slightly before serving warm or at room temperature.