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 and cook for 2 to 3 minutes until completely wilted. Remove from heat and let cool slightly.
03 - In a mixing bowl, combine the cooled 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 1/2-inch border along one long edge to help seal the roll.
05 - Starting from the filled long side, gently roll the pastry into a tight log. Brush the bare edge with a little beaten egg to seal. Using a sharp knife, slice the log into 16 even pieces.
06 - Place each pinwheel cut side up on the prepared baking sheet, spacing them about 1 inch apart. Brush the tops generously with the remaining beaten egg for a golden finish.
07 - Bake for 20 to 25 minutes until the pinwheels are puffed and golden brown. Allow to cool slightly on the tray before serving warm or at room temperature.