If it's only going to be an hour until you bake the next level, I would just leave it (covered) out untikl you're ready. However if you think it will be any longer than an hour, put it in the refrigerator for sure. Don't want to take any risks. Just make sure you let it come back to room temperature before you bake again.
When I have leftover batter, I do 1 of 3 things samples, freeze batter or make cupcakes for the daycare kids.
Sure can! Make sure you have ALL the air out of the bag before you freeze. To defrost you just pull it out and squeeze the batter every know & again. If your not going to use it right away, put in fridge & again sqeeze mix.
Yeah, I wouldn't do chiffon or angel food. Just your basic standard mix. And NO it doesn't affect end product. As long as you thaw it correctly.
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