Preheat the oven to 400°F (200°C).
Roll out the pie crust on a lightly floured surface.
In a bowl, combine strawberries, granulated sugar, cornstarch, and vanilla extract.
Spread the mixture over the pie crust, leaving a 2-inch border.
Sprinkle the chocolate chips over the strawberry mixture.
Fold the edges of the crust over the filling.
Brush the beaten egg over the crust edges.
Bake for 40 minutes or until the crust is golden brown.