Strawberry Shortcake

This is very similar to my Mom's Surprise Cake recipe.  I've also added her recipe for strawberry sauce because we always prefer it on our shortcake. 

Strawberry Shortcake
1 white cake mix
1 small box instant vanilla pudding mix
1 c. sour cream
1 c. milk
1/4 c. vegetable oil or melted butter
1 t. vanilla
3 egg whites or 2 whole eggs
Cream Cheese Layer:
8 oz. cream cheese, softened
1 c. powdered sugar
1 t. vanilla
8 oz. Cool Whip, thawed (More if you want to serve a dollop on top)
Strawberry sauce** recipe below or simply serve with a spoonful of sliced strawberries
Spray a cookie sheet pan (15x10x1").
Place in mixer bowl:  cake mix, pudding mix, sour cream, milk, oil, vanilla, and eggs. Beat for 2 minutes. Pour batter into prepared pan and bake at 350  for 15 to 20 minutes.  Let cool.
Place in mixer bowl:  cream cheese, powdered sugar and vanilla. Beat until smooth, then fold in the Cool Whip. Spread cream cheese layer over cooled cake.  Place in the fridge until serving time, 30 minutes of more.  Top with strawberry sauce or strawberries at serving time with an additional dollop of Cool Whip on top if desired. 

Mom's Strawberry Sauce
1 1/2 c. sugar
1 pkg. strawberry KoolAid
1/3 c. instant clear jel
2 1/2 c. water
2 to 3 c. sliced strawberries (I prefer fresh but frozen works too)