Brush egg wash over a store-bought crust and bake according to package instructions or at 375°F for 8-12 minutes until golden brown.
Let it cool completely.
In a medium bowl, whisk eggs and granulated sugar together until smooth.
In a separate bowl, mix 2 tablespoons of milk with cornstarch until fully dissolved, then add this to the egg mixture.
Warm the remaining milk and butter over medium heat until steaming, being careful not to let it simmer.
Slowly pour the warm milk into the egg mixture while whisking continuously to prevent the eggs from cooking.
Transfer the entire mixture to a saucepan over medium heat, stirring constantly until it thickens, about 5-10 minutes.
Strain the glaze through a fine-mesh sieve into a heat-safe bowl to remove any lumps, then whisk in red food coloring and powdered freeze-dried strawberries.
Refrigerate for at least an hour, ideally overnight.
Using a hand or stand mixer, beat heavy cream, confectioners' sugar, and vanilla until stiff peaks form, being careful not to overbeat
Spoon half of the chilled strawberry glaze into the cooled pie crust, spreading it evenly across the bottom and up the sides.
Arrange fresh quartered strawberries over the glaze, then sprinkle powdered sugar on top.
Generously add whipped cream over the strawberries, shaping it into a dome, and garnish with a halved strawberry.
Serve cold and keep refrigerated until ready to eat to maintain freshness and texture.