I have never used a extender and was wondering how to do it? Anything you can tell me about this would be great! What is your favorite extender? Thanks in advance!
If you check in the recipes section on this site you will find one. You just follow the directions stated on the box and then add the extender as stated. I don't have a favorite so, I can't help you there. But, CC has a very good chocolate extender recipe.
The extender ingredients are 'in addition to' the regular ingredients listed on the box.
I always use an extender to box cake mixes cuz it makes the cake taste a whole lot better 
When I first started using it, I used non-fat yogurt and/or fate free sour cream.....but honestly, I think using the 'real' stuff makes it taste better.
I use real, full-fat sour cream in my orange creamsicle cake and man oh man, its good...and I CAN tell the difference.
My favorite is the WASC (White almond sour cream) extender. I've got everyone (family/friends) hooked on it! I use it for every kind of cake I make too. Ex: for butter pecan cake, I follow the recipe, except use butter pecan flavoring instead of the amond extract. I use real sour cream too - just like Wendoger. It does make a difference.
great. 
I just made the WASC cake recipe I found in the recipes section. NOWHERE on there does it say anything about making the mix 'normally' then adding the other ingredients. . . please tell me that the one I chose is just the stuff listed and I didn't waste all that money because it's not going to turn out, or is going to turn out nasty. 
this is the one I used.
http://www.cakecentral.com/cake_recipe-2322-White-Almond-Sour-Cream-Cake.html
Well, the recipe I used must be 'as-written' because I did just pull
the first cakes out of the oven and from what I trimmed off the top, they
are fabulous. I've never had a cake come out of a pan looking like
that. . but the trimmings tasted very, very good. This is a practice
cake for a shower cake I have to do in a week and a half and I've never
done a wasc cake. So far, so good. 
I just made the WASC cake recipe I found in the recipes section. NOWHERE on there does it say anything about making the mix 'normally' then adding the other ingredients
That recipe has the 'regular' ingredients incorporated. You did not waste you time & ingredients.
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