I couldn't pick one, so I picked them all. Strawberry cake is the best.
It should be like 7 Will +2, 2 Psyche +1 and 1 Intellience/Cha +1 (maybe).
Flour, Strawberry x2, Water, Egg
Strawberries seem pretty rare and Will seems to not have many foods because it's a new item. So I think making a strong Will baking item might create a good draw for it. The amount of required Strawberries will hamper the ability to amass it, but still make it rather powerful for a will gain.
Heck, maybe even throw almonds in there. People like to put those on desserts. Or just any nut actually?
