Add all ingredients to a blender and blend until creamy and smooth, scraping down sides as needed. If too thick, add more dairy-free milk.
Taste and adjust flavor as needed. For more pumpkin flavor, add more pumpkin pie spice. For more sweetness, add more banana, or a bit more vanilla protein powder - optional (or a bit of maple syrup, agave or stevia extract).
Serve immediately. Best when fresh, though will keep in the refrigerator well covered up to 2 days.
*We like buying bagged organic spinach and throw it right in the freezer! This way it keeps fresh for weeks and makes your smoothie cold and creamy. However, fresh spinach will work fine, too. You may just want to add 1-2 ice cubes to cool it down. *DIY Pumpkin Pie Spice. *Nutrition information is a rough estimate calculated without protein powder or greens powder.