Combine pumpkin pie and ice cream in blender. Add a few Tablespoons of milk and blend until combined. Add more milk, in preferred, to thin the milkshake.

Pour into glass and top with a generous scoop of Cool Whip.

Sprinkle with pumpkin pie spice, cinnamon sugar and crumbled pie crust crumbs.

Garnish with a wedge of pumpkin pie.