1 1/2 cups cold coffee
2 cups whole milk
1/4 cup chocolate syrup
1/4 cup white sugar
1 tablespoon whipped cream (optional)
Pour coffee into an ice cube tray. Freeze until solid, 3 to 4 hours.
Place frozen coffee cubes in a blender. Add milk, chocolate syrup, and sugar; blend until smooth.
Pour coffee mixture into 2 glasses and top with whipped cream.