Add the oat milk, maple syrup, vanilla, cinnamon, nutmeg, and black salt (if using), to a jar or a blender. Shake or blend until combined and foamy.
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 desired.
Store leftovers in the fridge in an air-tight container for up to 4 days. Shake or mix again before serving as the spices will have settled.
Notes
What kind of oat milk? To make the oat nog, you can use my homemade oat milk recipe, or you can use store-bought oat milk. I used Earth's Own Barista Oat as I love how creamy it is and how it foams up when shaking or blending.Oat milk substitute: Feel free to substitute the oat milk for your favorite plant-based milk such as soy or almond.