A box of prepackaged cake mix, which usually has a "best before" date rather than an expiration date, can usually be used for up to 5 months past the box's printed date. This is contingent on the box being unopened and kept in a cool, dry place, such as a kitchen pantry.
There are certain ways to tell if a boxed cake mix, brownie mix or muffin mix has gone bad. Once the wet ingredients, such as water, oil, milk or eggs are added to the mix, the cake should rise when baked. This is because the wetness activates the leavening ingredients (typically baking powder or baking soda) in the cake mix. If the mix has gone bad, the cake will be flat and dense, and should be discarded.Learn More
Unpopped popcorn does not typically have an expiration date. Instead, manufacturers usually stamp it with a "best by" date to indicate the date on which freshness can start to deteriorate.Full Answer >
Bread can be eaten past the "best by" or expiration date. A package of plain bread can last five to seven days past the best by date. Bakery bread has a shorter lifespan of two to three days past the best by date.Full Answer >
The printed expiration date on milk is really just a sell by date, and milk is usually still good for a few days after that. Milk should last up to 7 days past the sell-by date if properly refrigerated.Full Answer >
According to Eat By Date, if they are stored correctly, unopened cake mix and unopened icing can be used and eaten even after they are out of date. Eat By Date explains that, unopened, these pantry items each have a shelf life of about four months past the printed sell-by-date.Full Answer >