Add all the ingredients to a blender and puree for about 30 seconds.
Taste to adjust flavor and serve immediately.
Notes
Using a frozen banana leads to a creamier smoothie.
Feel free to use fresh peaches if you have some on hand. Make sure to peel it first.
Wash the spinach before using.
To store: You can store the peach green smoothie for an extra day in the fridge but you'll have to give it a mix as the smoothie may separate in the fridge.
To freeze: Freeze the smoothie in an airtight container with some space on top as the smoothie will expand.