I was just reading on another post. And can someone tell me if is true a scratch cake like a pound cake ---if the baking powder is expired it would make the cake over flow ?????? because this is what might have happened to me the last 2 time i tried to bake one . I thought I was over creaming the sugar and butter ( is there such a thing as over creaming ?) Thanks in advance !!!!! dee

I would think that if the baking powder were expired, that the cake wouldn't rise well and would deflate, not overflow.

Sounds to me like there was just too much batter in the pan.

Rae

After six months, baking powder will begin to weaken, and after a year it should be thrown away.

you can test to see if your baking powder is still good to use.

Mix 2 teaspoons of baking powder with 1 cup of hot tap water. If there's an immediate reaction of fizzing and foaming, the baking powder can be used. If the reaction is at all delayed or weak, throw the baking powder away and buy a fresh can.

Very helpful info Diane! I've always wondered this. Thank you!