Making your Easy Strawberry Napoleon can be done in a few straightforward steps:

1. Preheat the Oven: Start by preheating your oven to 400°F (200°C).

2. Prepare the Puff Pastry: Roll out the thawed puff pastry sheets on a lightly floured surface. Cut each sheet into rectangles measuring about 3×5 inches.

3. Bake the Pastry: Place the pastry rectangles on a lined baking sheet. Prick them with a fork to prevent excessive puffing. Bake for 20-25 minutes or until golden brown and crisp.

4. Whip the Cream: In a mixing bowl, whip the heavy cream until it softens. Gradually add powdered sugar and vanilla extract, continuing to whip until stiff peaks form.

5. Prepare the Strawberries: If desired, toss sliced strawberries with cornstarch to enhance their sweetness and prevent excess juice. Set aside for a few minutes.

6. Assemble the Layers: Once the pastry is cooled, begin layering: place one piece of pastry on a serving plate, spread a generous layer of whipped cream over it, then top with sliced strawberries. Repeat the layering process for two more layers.

7. Top It Off: Finish with a final piece of pastry on top. Lightly dust with powdered sugar for an attractive finish.

8. Chill (Optional): Place in the refrigerator for about 30 minutes to help set the cream and allow flavors to meld before serving.