I bake with frozen bananas all the time, and they work just as well as fresh ones. To freeze bananas, simply place them in the freezer with their peel on. When you're ready to use them in a recipe, place the frozen bananas in a bowl and let them thaw at room temperature. Be aware that they will release some liquid during thawing, which you can discard. Once thawed, use the frozen bananas just like fresh bananas in your favorite baking recipes, including muffins and breads.