01 - Preheat the oven to 400°F. Line a baking tray with parchment paper.
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 fully 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.
04 - Roll out the gluten-free puff pastry on a surface lightly dusted with gluten-free flour. Spread the spinach and feta mixture evenly across the pastry, leaving a ½-inch border along one long edge.
05 - Starting from the long side opposite the border, gently but firmly roll the pastry into a tight log. Brush the exposed border with beaten egg and press gently to seal.
06 - Using a sharp knife, slice the log into 16 even pieces. Arrange each pinwheel cut side up on the prepared baking tray, spacing them about 1 inch apart.
07 - Brush the tops of each pinwheel generously with the remaining beaten egg to ensure a deep golden finish.
08 - 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.