Preheat your oven to 200 degrees C (400 degrees F).
Inside an oiled cooking pot, add the Yellow Onion (1), Stock Cube (1), Frozen Green Peas (1/2 cup), Potato (2), and Carrot (4). Cook everything for about 5 minutes.
Cut a circle out of the Puff Pastry (4). Divide the vegetable mixture among the four circles, and fold each pastry to close everything. Using a fork, make some vent holes on top of each pastry and bake in side 200 degrees C (400 degrees F) for about 20 minutes.