Preheat oven to 375. In a large bowl, mix together the sugar and cornstarch.

Add the strawberries, raspberries, and blueberries, until berries are coated. Let stand for about 15 minutes.

Place one pie crust in the bottom of a pie pan. Pour mixture into your pie crust.

Then put your other pie crust on top and pinch the edges to seal.

Cover with foil and bake for 25 minutes.

Remove foil and continue baking for another 30 minutes.

Remove from oven and let cool down.

Eat and enjoy!