Preheat oven to 400°F degrees. Place puff pastry on baking sheet lined silicone mat or parchment paper.
Cut a line around the edge of the pastry to make a border. Bake for 15 minute or until pastry is golden brown.
When done use a flat spatula to press down the center of pastry. Set aside.
Place on grill pan drizzle with olive oil, sprinkle with salt and grill for 20 minutes or until onions are softened and green beans are lightly charred.
Top pastry with onions, then top with greens beans. Sprinkle with feta cheese. Serve and ENJOY!