I'm looking for 2 "add to cake mix" recipes for chocolate and yellow cakes. I am making a 1 layer half sheet and covering it with fondant and another 3/4 of a layer and I'm afraid it will collapse if I use a regular cake mix!! I need a yellow recipe for the bottom and chocolate for the top. Thanks a million!!! )

You can use this recipe with any cake mix, and it is wonderful....

Durable Cake for 3D and Wedding Cakes
http://cakecentral.com/recipes/1972/durable-cake-for-3d-and-wedding-cakes

Thank you so much!! I had been looking for this in the recipes section, but didn't know what to search for. You are a lifesaver!!! )

The Durable recipe for white cake and this one for chocolate:

http://cakecentral.com/recipes/6963/firm-chocolate-cake

are two of my most favorite and most used recipes. I use them for any cakes that are carved or that have to support significant weight, such as when I make a cake with lots of molded fondant animals, rocks, trees, etc.

They are both delicious and always get RAVE reviews for taste, density, etc.

If I need to keep square corners or hold shaped curves, etc. I cover them with chocolate ganache (under the fondant) rather than buttercream. This combination produces a really durable, sharply detailed cake.

I am glad I could help.

I'm glad to see this recommendation for durable cake. I'm going to do a 3d standing Mickey Mouse and was thinking of using the durable cake recipe. I've never tried it so I didn't know how it would turn out.

I've always used the same cake mix I use for the rest of my cakes but instead of adding the 1/3 cup of oil that it calls for, I only add like 1 Tablespoon. This makes it much more firm.

a plain box mix with nothing added can support fondant without any problems

Just wanted to let you know how it turned out! Thanks again for your help! )