In a large bowl, combine the heavy whipping cream, powdered sugar, and vanilla extract. Beat until stiff peaks form. Using a hand mixer takes about 3–4 minutes on medium speed. If whisking by hand, it will take about 10 minutes.
Wash and slice the strawberries.
Using a deep 9x13-inch dish, spread a very thin layer of whipped cream on the bottom.
Add a layer of graham crackers, followed by a thin layer of whipped cream and a layer of sliced strawberries.
Repeat the layers of graham crackers, whipped cream, and strawberries until you've used all of the filling, creating about 3–4 layers.
Finish with a generous layer of whipped cream on top and decorate with halved strawberries.
Refrigerate for at least 4–6 hours, or overnight for the best flavor and texture.
Before serving, dust with a little powdered sugar if desired. Enjoy every creamy, berry-filled bite!