Brew a shot of espresso or prepare a strong cup of coffee using your preferred method.
In a separate container, combine the protein powder with a small amount of milk, stirring until well-mixed and free of lumps.
Froth the remaining milk using a milk frother or by heating and whisking until it reaches your desired consistency.
Pour the brewed coffee into a cup and add the protein mixture, stirring until fully incorporated.
Gently pour the frothed milk over the coffee-protein mixture, creating a layered effect.
Add sweetener if desired, and stir to combine.
For an iced version, allow the coffee to cool, add ice cubes, and follow the remaining steps.
Serve your Protein Coffee Macchiato immediately and enjoy!