Combine Ingredients: Add the oat milk, maple syrup, vanilla, ground cinnamon, nutmeg, and black salt (if using) to a jar, blender, or cocktail shaker. Shake vigorously or blend until combined and foamy.
Serve: Pour over ice, adding a shot of spiced rum or bourbon per serving if desired. Garnish with extra nutmeg, a cinnamon stick, or star anise if you like.
Store Leftovers: Keep leftovers in an airtight container in the fridge for up to 4 days. Shake or mix again before serving as the spices will settle—this is normal for plant-based drinks.
