How to freeze bananas for smoothies is easy as can be. Simply peel, slice, place flat on a baking sheet, freeze, and then rely on them whenever you have a smoothie-making whim. Also works for mango and avocado.

How to Freeze Bananas
Ingredients
Directions
Peel the bananas and chop them into 1/2 inch (1.5 cm) thick slices. You can slice them thicker, but thinner slices are easier for the blender.
Spread out the slices on a baking tray or cutting board covered in parchment paper and place in the freezer overnight. This prevents the banana slices from sticking together.
When frozen through and through, toss the slices into freezersafe containers or resealable plastic bags (preferably those little snack-size bags in which you can handily fit just 1 banana or around 10 to 15 slices) and keep in the freezer until needed. Whip out a single-serving bag of frozen banana next time you make a smoothie and use it instead of ice. Originally published August 8, 2016.
Variations: Frozen Avocados and Frozen Mangos
You can chop and freeze avocados and mangos in the same way as bananas. Wait until they are very soft and ripe to get maximum flavor. Just remove the peel and pit and cut the avocados or mango into 1 inch (2.5 cm) cubes or slices. You can squeeze a little lime or lemon juice on top of the avocados to keep them from turning brown. Then follow steps 2 and 3 from the frozen banana method and use in smoothies. They also keep in the freezer for months.
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