Mix all ingredients with a hand mixer until batter is smooth. Pour batter into a greased 9 by 13 baking dish. Bake at 350 degrees for 40 minutes or until toothpick inserted in center comes out clean.
For Strawberry glaze
Add sugar and water to a large sauce pan stir and bring to a boil. Add sliced strawberries to boiling water sugar mixture, reduce heat and simmer for 10 minutes or until strawberries begin to break down into mixture. Mix cornstarch and remaining water together and pour into strawberry glaze, whisk until glaze starts to thicken then remove from heat.
Slice cake into squares and place on serving plates. Top with strawberry glaze, cool whip and fresh berries.
Recipe by at https://www.craftyourself.com/triple-berry-treat/