I ended up turning this into a trifle. I baked it as a sheet cake and then as I put the glass pan on the stove top it shattered. I was able to save the majority of the cake but it wasn't in one piece. The other problem I had wasn't due to the recipe was that I was taking this to a party and didn't have a cake plate big enough. So the trifle bowl had to do. I did increase the amount of strawberries to nearly 8 cups.
This is a nice boxed-cake recipe that I made as a sheet cake. To make it more strawberryish, next time I would use strawberry cake mix. Using sour cream in the cake made only a slight taste difference (barely noticable), but did make a nice flavoring in the Cool whip topping. Thanks for sharing your friends recipe. :)
A wonderful, tasty cake. My family really enjoyed this one. Would not change a thing. Thank you so much!!!