Don't Skip This Step Before Freezing Your Bananas - Tasting Table
Briefly

Freezing bananas is simple and effective for various culinary uses, but peeling them beforehand is essential. Whole bananas with peels freeze poorly, turning sticky and frustrating to use. For best results, peel and freeze bananas individually on a baking sheet, then transfer to a zip-top bag or container. If already frozen with the peel, allow them to sit at room temperature or rinse under warm water for easier peeling. Thawed bananas will be mushy, suitable for recipes that require mashed bananas.
Bananas are easy to freeze for smoothies, baking, and snacks if peeled beforehand; freezing with peel makes them sticky and difficult to use later.
To best freeze bananas, peel, individually freeze on a parchment-lined sheet, then store in a zip-top bag or airtight container.
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