So, What's the Best Way to Ripen Bananas Fast ... I placed two whole, unpeeled bananas on a microwave-safe plate and microwaved them on full power in 30-second intervals until warm to the touch ...

The skins will turn brown, but the fruit inside will soften and sweeten. You can also ripen bananas in the microwave. To do this, poke holes all over the unpeeled banana with a toothpick or fork.