Next, drizzle nine round spots of olive oil onto the foil, evenly spaced to accommodate the puff pastry squares.
Now, it's time to layer the ingredients to create the Mediterranean flavor explosion. Begin by placing a tomato slice on top of each spot of olive oil on the baking sheet.
Next, add the halved Kalamata olives on top of the tomatoes. Then, sprinkle the diced red onions and crumbled feta cheese over the olives. Add salt and pepper to taste!
Cut your puff pastry sheet in to 9 squares (roughly 2-3 inches by 2-3 inches) and cover each section of layered ingredients on the baking sheet. Gently press the pastry down around the edges to secure the filling and brush with remaining olive oil.
Preheat your oven to 375 degrees Fahrenheit (190 degrees Celsius). Place the baking sheet with the assembled pastries in the oven and bake for approximately 20-25 minutes or until the puff pastry turns light golden brown and crispy.
Once your Greek pastry is finished, remove from the oven and flip them over! Serve warm with tzatziki dip or drizzle with a balsamic glaze.