Yes, 4 boxes....2 for each layer. Just don't fill the pan more than 2/3 full!! ![]()
A box mix yields from 4-51/2 cups of batter.
An 11x15x2 sheet pan requires 11 cups of batter.
An 11x15x3 sheet pan requires 16 cups of batter.
http://www.wilton.com/cake/cakeprep/baking/times/index.cfm
The WASC cake recipe, using DH white yields a tad over 14 cups of batter.
Here's the expanded flavors recipe:
http://tinyurl.com/2cu8s4
Guess you could get by with 3 DH mixes using WASC cake recipe. (Or 1-1/2 doctored mixes per layer.)
HTH
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