You can easily determine whether you need a fresh supply of baking powder by pouring 1/4 cup of hot tap water over 1/2 tsp. of baking powder. If the mixture doesn't bubble actively, it's too old.
If you have too many potatoes, stop them from sprouting by storing a few apples with them. If you have peeled too many potatoes, cover them with water and store in the refrigerator.
