Ingredients:

1 1/2 oz Baileys Irish Cream
1 oz skim milk (or use whole milk or cream for a richer taste)
1/2 oz vodka
1/2 oz Kahlua (coffee liqueur)
Ice (enough to fill the glass)
Instructions:

Fill a rocks glass with ice cubes.
Pour in the vodka and Kahlua over the ice.
Add the Baileys Irish Cream.
Pour in the milk (or cream) to top it off.
Stir gently to combine.
Optional: Garnish with chocolate shavings, a dusting of cocoa powder, or a coffee bean for extra flair.
Tips:

For a sweeter and creamier version, replace milk with half-and-half or heavy cream.
Want it blended? Add all ingredients to a blender with ice and blend until smooth for a frozen treat.