Prepare the Shortbread Crust. Preheat your oven to 350°F. Line a 9x13-inch baking dish with parchment paper. In a large bowl, cream together the butter, sugar, vanilla extract, and salt until smooth. Add the flour and mix until a crumbly dough forms. Press the dough evenly into the bottom of the prepared baking dish. Bake for 15 minutes or until lightly golden. Remove from the oven and set aside.
Make the Strawberry Filling. In a medium saucepan, combine the chopped strawberries, sugar, cornstarch, and lemon juice. Cook over medium heat, stirring frequently, until the mixture thickens and the strawberries become soft (about 5-7 minutes). Remove from heat and let cool slightly before spreading over the shortbread crust.
Prepare the Crumb Topping. In a bowl, mix the flour, sugar, and melted butter until crumbly and sand-like in texture. Sprinkle evenly over the strawberry filling.
Bake to Perfection. Return the pan to the oven and bake for 25-30 minutes, or until the topping is golden brown and the filling is bubbling. Let the bars cool completely before slicing for clean cuts and best texture.
Garnish and Serve. Top with whipped cream and fresh strawberries before serving for an extra-special touch.