Hi guys. I recently purchased the Cake Mix Doctor book and I would love to try out the recipes but I'm co fused at to what brand of mixes are 18 oz? Usually I see most that are 15. Would it really make a difference if I don't use one that has the amount of mix exactly? For those of you who follow her recipes let me know what you do. Thanks! :) 

i have heard or read that the 15 oz cake mixes work ok in her recipes -- what i would do is add 3 oz of cake mix from another box -- i've only used her melted ice cream cake -- it's wonderful

You can just buy an extra box and add enough to bring each mix up to 18.25 ounces (one box of mix will fix 5 others).

 I've also seen people just adding the needed amount of self-rising flour to make up the difference. 

All the cake mixes have shrunk recently, since the book was published.  I think her website has suggestions for how to make up the difference.

Sort of how ice cream used to come in 1/2 gallon containers, then 1.75 quarts, and now most are down to 1.5 quarts.  They think you'll notice the size shrinking less than you'll notice a price increase.

I have an old pumpkin cake recipe that refers to a "16 oz" can of pumpkin, but now the closest size is 15 oz (which still works).

Thanks everyone! I was able to get the cake mix doctors advice once I pulled up the website. Go figure lol. She says to just whisk in 6 Tablespoons of all purpose flour to the mix.  She says it adds body to the cake and prevents it from shrinking when cooled :D Yay