Great question — answering as the UphillTech team:
I‘m not sure how much leavening the baking powder will really accomplish in this recipe but anyhow, that’s your „critical ingredient“. To be on the safe side, I would recommend you prepare your recipe until „day 2“, then on day three split the cherry mix and the remaining ingredients in two and do the final mixing in two batches so that you can bake them right away. If you choose to finish all batter at the same time, just let it sit at room temperature, or, if you want to be on the super-safe side (eggs, > two hours) you can put it in the fridge, but that’s going to increase the baking time and aggravate the „burnt-edge-raw-center“ issue. Now some might argue that for food safety reasons...
Full answer by Stephie: https://cooking.stackexchange.com/a/85142 (CC BY-SA 3.0).
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