Can You Save Leftover Mashed Banana (And If So How Long)? - Tasting Table
Briefly

Peeling, mashing, and refrigerating or freezing bananas at peak ripeness ensures you always have them for recipes, reducing frustration over overripe fruit.
To prevent bananas from oxidizing, add a teaspoon of lemon juice per cup of mashed banana. This keeps the color fresh until use.
Mashed bananas can last up to seven days in the fridge in a tightly sealed container, but should be discarded if any fermentation smell is present.
For longer-term storage, freeze mashed bananas in portions; they'll maintain peak quality for two to three months, ensuring you have them when needed.
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