Add the frozen banana, pumpkin puree, Greek yogurt, milk, maple syrup, pumpkin pie spice, ground cardamom, vanilla extract, and pecan butter to a blender.

Blend until smooth and creamy. If the smoothie is too thick, add a bit more milk. If you want a thicker smoothie, add ice cubes and blend again.

Taste the smoothie and adjust the sweetness and spice level.

Pour the smoothie into a glass. Top with a sprinkle of cinnamon and copped pecans.

Sip and enjoy the delightful blend of warm pumpkin spice!