In a small pot, melt butter over low - medium heat.
Add turmeric, ginger, cinnamon, black pepper, and nutmeg. Whisk to combine with butter. Keep stirring until spices are fragrant, about 30 seconds - 1 minute.
Add milk, whisk together with spices. Keep over heat until milk is steaming slightly, and a golden color. Whisk frequently.
Remove from heat. Add sweetener as desired (see note).
(Optional Step) With a blender/immersion blender/frother/a strong arm and a good whisk, blend milk mixture about 30 - 40 seconds. The froth that forms on top is delicious, but this also aerates the drink, making it taste creamier.