The Problem With Costco's Bakery Bagels, According To Customers - Tasting Table
Briefly

Costco's Kirkland Signature bagels are beloved for their fresh, preservative-free appeal; however, this results in a shorter shelf life compared to supermarket bagels. To enjoy them longer, it is recommended to freeze them: slice in half, individually wrap, and store in an airtight bag. Defrosting can be effectively done by sprinkling water on them and warming them in the oven, restoring their fresh texture. The USDA advises against cutting away mold, as it penetrates deeper into the product, making proper storage essential.
Costco's Kirkland Signature bagels mold faster due to a lack of preservatives, but many customers appreciate the fresh ingredients that contribute to their shorter lifespan.
Freezing bagels is an effective method to extend their freshness. Slice them in half, wrap individually, and store in an airtight bag.
Read at Tasting Table
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