In a mixing bowl, beat the softened cream cheese with the powdered sugar and vanilla extract until smooth and creamy.
In another bowl, whip the heavy cream until stiff peaks form. Gently fold the whipped cream into the cream cheese mixture until well combined.
In your 9x13 inch baking dish, layer the bottom with a single layer of graham crackers to cover the entire base.
Spread half of the cream cheese mixture over the graham crackers, smoothing it with a spatula.
Add a layer of sliced strawberries on top of the cream cheese mixture.
Spread half of the strawberry pie filling over the strawberries.
Repeat the layering process: add another layer of graham crackers, the remaining cream cheese mixture, the rest of the sliced strawberries, and finally the remaining strawberry pie filling.
Top the final layer with the whipped topping and spread it evenly across the surface.
Refrigerate the lasagna for at least 2-4 hours, or until set.
Once set, cut into squares and serve chilled.