01 -
Preheat oven to 400°F (200°C) and line a baking sheet with parchment paper.
02 -
In a skillet, heat 1 tablespoon of olive oil over medium heat; sauté onion until translucent (about 5 minutes).
03 -
In a bowl, combine sautéed onion with spinach and feta; mix well.
04 -
Roll out puff pastry on a floured surface and cut into 4-inch squares.
05 -
Place a spoonful of the spinach-feta mixture in the center of each square, fold diagonally, and seal edges with a fork.
06 -
Brush tops with remaining olive oil and bake for 20 minutes or until golden brown.