Thaw the gluten-free puff pastry in the refrigerator until soft enough to unroll.
Rinse and dry the spinach well to remove extra moisture.
Mix the spinach, feta, cream cheese, garlic, and herbs in a bowl until smooth and combined.
Line a baking sheet with parchment paper.
Spread the filling evenly over the pastry, leaving a small border on all sides.
Roll the pastry tightly from the long edge to form a log and chill it for 20–30 minutes to firm up.
Slice the chilled log into even rounds and arrange them on the prepared baking sheet.
Brush the tops with egg wash and bake at 400°F (200°C) for 12–15 minutes, until golden.
Cool slightly before serving. Arrange on a platter and serve warm or at room temperature.