All you need is boiling water.
I'm pretty sure I have baking powder lying around from when Home Alone was in theaters. I also have a canister or two that likely dates back to the 2014 NCAA Men's Basketball Tournament. The question is, are any of them still good for my baking needs today? Despite years of baking in my own kitchen, a summer stint cooking in a professional one, and a culinary school degree under my belt, I don't have a darn clue.
Well, figuring out if baking powder is okay to use or not, as it turns out, is only a few steps away. As Food52 describes in a recent article, all you have to do is spoon about a half-teaspoon of baking powder into a bowl and pour in around a quarter-cup of boiling water. Does the combo bubble up? If it does, the baking powder is fine to use. If it doesn't bubble, it's time to toss your baking powder in the trash.
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Well, I guess it's time to give those 2014 March Madness containers a whirl. Sans boiled water test, I think it's finally time to part with the Home Alone-era tin, though.