Wash the pear well and slice it into quarters, removing the core and seeds. I usually leave the skin on since it blends smooth and adds extra fiber. If your pear is very firm, let it ripen on the counter for a day or two first for the best flavor.
Place the pear, frozen banana, protein powder, cinnamon, and cardamom into your blender. Pour in the milk next so the blades have enough liquid to move everything around freely. This order helps the blender work through the fruit without straining the motor.
Add the ice and blend on high for about 30 to 45 seconds, or until everything looks silky and thick. Stop halfway through to scrape down the sides if needed. You want no chunks of pear left, just a uniform, creamy consistency.
Take a quick look at the texture before pouring. If it feels too thick to sip comfortably, splash in a little more milk and blend again briefly. If it feels too thin, toss in a few extra ice cubes and blend once more.
Pour the smoothie into your favorite glass right away, since it tastes best fresh and cold. I like to give it one last stir with a straw before the first sip. Enjoy it as a quick breakfast or an afternoon pick-me-up.