I just looked up the Heavenly WASC recipe. It is very similar to the other wasc's. The Heavenly is a 2 box batch, so in it's case...one recipe of Heavenly would make one of your 12x18 pans. It takes 2 boxes of extended recipes to fill a 12x18...or 3 boxes of an undoctored mix.
My DH WASC recipe yields about 6.5 cups per mix. It's usually a tad more, but I use 6.5 for my calculations. More is better than not enough!
Two mixes of WASC will fill the Wilton 12x18. I make two and a half recipes (one mix per recipe) to fill my Magic Line 12x18.
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