Making the Hot Buttered Rum Cocktail is simple and straightforward. Follow these easy steps:

1. Combine Ingredients: In a heatproof mug or glass, add the softened butter, brown sugar, ground cinnamon, nutmeg, and vanilla extract.
2. Mix: Using a spoon, mix the ingredients together until they form a smooth paste.
3. Add Rum: Pour in the dark rum and stir well to blend with the butter and sugar mixture.
4. Heat Water: Boil water and pour it into the mug until it reaches your desired fullness, leaving some space at the top.
5. Stir Again: Stir well to ensure all ingredients combine and the butter and sugar meld into the hot water.
6. Garnish: If desired, add a dollop of whipped cream on top and a cinnamon stick for stirring.
7. Serve: Your Hot Buttered Rum Cocktail is ready to be enjoyed warm!

These straightforward steps will guide you to create an incredible cocktail that warms the soul.