Place eggnog, vanilla ice cream, whole milk, cookies, cinnamon, nutmeg, and rum (if adding) in to a blender.

Blend, on high, for about 2 minutes or until very smooth.

Pour into prepared cookie rimmed glass.

Garnish with additional nutmeg and cinnamon as needed. Enjoy!

Combined crushed cookies and nutmeg on a small plate.

Place melted white chocolate on a small plate.

Dip rim of milkshake glass into white chocolate. Then into the cookies and nutmeg until fully coated.

Reserve for later use.