Slice the 1/2 vanilla bean lengthwise. Place the vanilla bean, milk and brown sugar in a small saucepan. Bring to a gentle boil - stirring occasionally. Remove from heat as soon as it starts boiling. Set aside and let steep for 10 minutes.
Using an immersion blender, bend the milk mixture until frothy - about 20 seconds. Alternatively, you can place the milk mixture in a standard blender and blend on high until foamy.
Pour the Caffe Americano blend into a serving cup. Top with the vanilla-infused milk.
Dash of nutmeg.
Grab your marker and cup, now you're a certified barista!