Add egg white, sugar, and vanilla extract into a bowl, then whip until soft peaks form.
Heat milk in a saucepan over medium heat until warm but not boiling.
Brew espresso or strong coffee using your preferred method.
Pour warm milk into a glass, filling halfway.
Add espresso slowly over the milk to create layers.
Spoon whipped foam gently on top.
Drizzle caramel sauce generously over the foam.
Add ice before milk if making an iced version.
Serve immediately and stir slightly before sipping if desired.