If you have leftover biscuits, you know they can go stale quickly. Put them in an airtight container with a slice of bread to keep them fresh.
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This is an old tip, but worth mentioning for anyone who has't heard it. Put your baked goods in an air-tight container along with some fresh bread. Livestrong suggests putting a piece of wax paper on brownies or muffins so they won't stick to the bread, too. The bread prevents the goodies from drying out and getting stale, which means you'll have a few extra days to chow down.