If you have unripe bananas, there's an easy trick to get yellow bananas ready for banana bread — bake them! Place unpeeled, individual bananas on a baking sheet and bake for around 30 minutes at 300°F. The banana skins will turn black, indicating they're tender and sweet inside. Remove the pan from the oven. Once the bananas are cool enough to touch, you can peel and use them to make bread.