Add vodka, coffee liqueur, espresso, simple syrup, and peppermint schnaps to a shaker filled with ice and shake until well-chilled.
Strain into a chilled cocktail glass.
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Notes
Use freshly brewed espresso: Fresh espresso adds a rich, bold flavor and creates a creamy froth for the perfect texture.Chill your glass: Place your martini glass in the freezer for 10 minutes to keep the cocktail icy cold.Shake vigorously: Shaking the ingredients with ice helps create a frothy, well-chilled martini with a smooth finish.