I make the WASC with yellow/white/chocolate all the time and I always use three eggs (obviously I've never tried for a really WHITE white cake). Anyway, it works fine. If you're going to add peanut butter, you might want to cut back on the sour cream a little, so the cake won't be too heavy or greasy.
http://cakecentral.com/recipe/the-original-wasc-cake-recipe
This will answer your ?s![]()
YES! you certainly use a yellow mix and 3 whole eggs.
I don't remember ever adding PB but I bet it would be good although probably mild in flavor.
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