To freeze very ripe bananas to use in baking: Peel the bananas and place them whole onto a baking sheet. Freeze for 2 hours until solid. Transfer to a plastic bag or freezer safe container. (Suck out extra air from the bag with a straw if using a bag.) Use within 3 to 6 months. To thaw, place the banana at room temperature for about 2 hours (or refrigerate overnight), keeping both the solids and the liquid that releases from the banana to use in your recipe.
To freeze ripe bananas for smoothies: Slice the banana into 1/2-inch slices, then place them on a baking sheet. Freeze for 2 hours. Once solid, place in a freezer safe container. To use them in smoothies, about 15 1/2” banana slices = 1 medium banana.