Does Boxed Cake Mix Ever Really Go Bad? - Tasting Table
Briefly

Boxed cake mixes are typically printed with a "best by" date six months from manufacturing, indicating peak quality but not safety, as they never really "go bad."
Expired cake mix doesn't rise as well due to deteriorated leavening agents, affecting the final product’s flavor and texture, though it remains safe to eat.
Read at Tasting Table
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