
Stale snacks like chips, crackers, and pretzels lose their crunch by absorbing moisture, but you can revive them by heating them in an oven set to 200–225°F on a parchment-lined sheet[2]. Alternatively, you can use a 350°F oven for about 10 minutes for snacks like crackers or Chex mix[6]. For a faster fix, use a toaster oven, an air fryer, or even a microwave for about 20 seconds[2].
While staleness is a texture issue, spoiled food is unsafe to eat[2][3]. Always check for mold or expiration dates, and if you are unsure about the safety of leftovers, it is best to throw them out[2][3].
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