How to Revive Stale Food Like Popcorn, Cereal and Chips in the Oven

There's nothing worse than stale food. Here are some tips to revive it from food and lifestyle expert Alejandra Ramos. Pour stale cereal on a baking pan and leave it in a 300 degree oven for five to ten minutes. If you have stale popcorn, place it in the oven at 250 degrees for five minutes.