Preheat oven to 425 degree F.

Line large baking sheet (with sides) with parchment paper or silicone baking sheet.

Roll out dough of your favorite pie crust or use refrigerated pie crust.

Prick center a few times with a fork.

In medium bowl mix sugar, corn starch, lemon juice and frozen berries.

Pour berries into center of pie crust.

Fold edges up around sides.

Brush edges of pie crust with egg white and sprinkle generously with turbinado sugar.

Add butter on top of berries, in three or four small pads.

Bake for approximately 30 minutes or until crust is golden brown.

Cool completely before serving.