Add the banana, spinach, mint, almond milk, and protein powder (if using) to a blender. Fill with a few ice cubes and blend until smooth.
Next, add the chocolate chips and pulse a few times until broken up into smaller pieces. You want the chocolate chips to still have a little chew to them without turning the whole smoothie brown.
Recipe by Ally's Cooking at https://allyscooking.com/2018/01/08/healthy-mint-chocolate-chip-smoothie/