Combine flour, ½ cup sugar and butter to make a dough and press into a round pizza pan. Bake 15 minutes. Set aside to cool.
Beat cream cheese, vanilla and sugar until fluffy. Spread over cooled crust. Arrange sliced strawberries on top of cream cheese mixture.
Combine mashed strawberries, 4 tbsp. sugar and cornstarch in a saucepan. Cook over medium heat, stirring constantly, until thickened and translucent. Spread over sliced berries. Chill before serving.
