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Herein, is powdered peanut butter good past expiration date?
Powdered peanut butter has a declared stable shelf life of 4-5 years from packaging if properly hermetically sealed.
Subsequently, question is, can you still use protein powder after it expires?
Yes, out of date protein powder is safe to use. Since protein powder is such a dry substance there is very little risk of bacterial growth. If the protein has been opened its recommended you consume it six to eight months after the expiry date.
When cookies or chips get old, the stale taste is quite obvious. But as long as it doesn't smell bad (the oils in the cookie may go off over a long period of time), and it doesn't crumble apart in your hand, then it's okay to eat more of those snacks.