Counter method: To defrost frozen bananas, thaw them at room temperature for about 1-2 hours or in the fridge overnight. Microwave method: You can also thaw frozen bananas in the microwave by heating them for 10-30 second intervals at a time. It should take about 2-3 minutes to thaw depending on the microwave. Running hot water method: If the frozen bananas still have their peels, run each whole frozen banana under hot water in a sink for about 2 minutes. Remove the peel by hand once the peel has softened. You can also use a knife to slice along the side and remove the banana peel. Tips: After defrosting, the thawed bananas will leave a brown liquid. Strain and discard the excess liquid prior to baking. Excess liquid will cause the bread to be dense and gummy.