I’m the kind of person who doesn’t check ingredients before starting a recipe. This is usually a problem. I’ll be in the middle of creaming butter and sugar when I realize I’m out of eggs, or measuring dry ingredients when I notice there’s only 1/4 cup flour left. I’m constantly at the grocery store buying new supplies.
Except baking powder.
I think we’ve been using the same tin for years now. It just never runs out! The other day I flipped it over and saw that the expiration date had long gone. Luckily, it’s simple to check your baking powder for freshness.
Fill a small bowl with warm water.
Measure out about a teaspoon of baking powder and dump it into the water.
The baking powder should immediately fizz and bubble, letting you know it’s fresh. If there’s no action, throw it out.