In a mixing bowl, combine instant coffee, sugar, and hot water.
Using a hand mixer or whisk, whip the mixture until fluffy and stiff peaks form.
Prepare a glass by filling it with cold or hot milk.
Spoon the whipped coffee mixture over the milk.
Mix the whipped coffee into the milk using a spoon or straw.
Sprinkle cocoa powder or cinnamon on top if desired.
Serve immediately and enjoy!