I misplaced my cake extender recipe from cake central and have to make a 11X15 cake today. 
I check the recipes section of Cake Central and can't seem to find the one I originally had, but anyone will do for done. I know that it was box cake, plus 1 cup of all purpose flower, another egg added and to follow instructions on box, but I'm not sure if this is all required, can someone help me please. Thank you and have a great day. 
I use this one all the time and LOVE it.
Cake Mix extender
Serves/Yields: 3 x 9" cakes
Prep. Time:
Cook Time:
Category: Cake Mix Cakes
Difficulty: Easy
I've used this for any cake flavour. The result is a terrific , moist and dense cake that is easy to frost and decorate. Tastes like scratch cakes. I get rave reviews everytime I make a cake. I've used it for other 18" or slab cake pans. All I do is make 2 mixes instead of the one. I make each mix individually and then stir them together in a large bowl prior to pouring in the pan.
Prepare cake mix as per package directions. In addition to this add,
1 egg
1 cup flour
250 ml (or 8 oz.) sour cream or yogurt (I prefer to use low fat yogurt)
1 cup white sugar
1/3 tsp. salt
1 tsp. vanilla or other suited flavouring
Bake as per pkg. directions
Nutrition Information
Fat content will vary depending on whether or not you use full fat sour cream or yogurt. I've used them all including low fat sour cream, yogurt etc.... and the results are great each and every time.
Source:
Contributed by: lilscakes on Friday, April 29. 2005 at 18:55:28
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