If you want the smoothie to look like the one pictured, add about a tablespoon of the yogurt into the bottom of a glass and set aside.
Add the pumpkin, dates, milk, yogurt, vanilla, and spices to a blender (or blending container, if using an immersion blender). Mix on high speed until completely smooth.
Pour into the glass and swirl slightly with a spoon. Serve immediately.
This smoothie can be kept in a sealed container, like a glass jar with a lid, for a day in the refrigerator. It won't brown like banana smoothies.
Notes
Some spices have a really different taste when freshly ground (like nutmeg and cardamom). If you just have them pre-ground, don't worry, it'll still taste great.If you're using canned pumpkin puree, make sure it's just pumpkin with no other ingredients added. Sometimes pumpkin pie filling looks just like puree, and it won't work here.