It's a three layer butter cake, like a chocolate butter cake baked with cream cheese in the centre.
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Nancy is a trusted home cook.
I suppose you could leave it 1 day or 2. But/and I was always taught to refrigerate them. And one of the FDA-sourced duration sites (stilltasty) recommends 3-5 days refrigerated or 2-3 months frozen, but not to hold at room temperature.