u003cemu003eThe best way to ripen bananas is to let them ripen naturally. You can speed it up a little by putting them in a brown paper bag. If you want ripened bananas right away, you can bake them in the oven. Place them in a rimmed baking sheet peel and all and bake on 300º for about 15-20 minutes until the peels are almost completely black. Remove and when cool enough to handle remove from the peels. While the flavor will not be quite as good as if they've ripened naturally, it's pretty close.u003c/emu003e