Place all ingredients (starting with ½ cup liquid) in a high-speed blender and blend until smooth and creamy.
If necessary, add extra liquid to help it blend. Or, on the other hand, if smoothie is too runny, add some ice cubes to thicken it up.
Pour smoothie into a bowl and top with your favorite toppings! Options include fresh fruit, granola, cacao nibs, banana chips, dried fruit, nuts, seeds, shredded coconut flakes, a drizzle of nut butter, or whatever your heart desires.
Notes
If you don't have a pumpkin pie spice blend, you can sub with the following ingredients: ½ tsp. cinnamon + ¼ ground nutmeg + pinch of ground cloves