The shelf life of walnut cookies is generally between 15 and 45 days, depending on storage conditions and whether preservatives are added.
Handmade, additive-free walnut cookies can typically be stored for 15-20 days at room temperature in a sealed container. Industrially produced versions with preservatives can last 30-45 days. In hot and humid summer conditions, the shelf life will shorten to 7-10 days, while vacuum packaging or refrigeration can extend it to 2-3 months.
To determine if walnut cookies have spoiled, observe the surface for mold spots and check for a rancid smell (the odor of sour oil). If the texture becomes soft and sticky or has a sour or astringent taste, it has spoiled and should not be eaten. Walnut cookies contain a large amount of oil and nut components, making them susceptible to moisture and oxidation. It is recommended to store them in airtight tin or glass jars with a food desiccant.
Traditional walnut cookies have a low moisture content and are baked, giving them some preservative properties. However, modern methods, aiming for a crumbly texture, increase the amount of oil used, which actually shortens the shelf life. If you make a large batch at once, you can divide it into portions and freeze it. Before eating, you can reheat it in the oven at 150℃ for 5 minutes to restore its crispy texture.
