Frozen Coffee Cooler

6 C. ice cubes

4 C. brewed coffee, cooled

1 C. coffee liqueur

3/4 C. sugar

1 t. ground cinnamon

1 C. half-and-half or milk

Garnishes: whipped cream, ground cinnamon

Process half of first 5 ingredients in a blender until smooth.

Pour coffee mixture into a large pitcher. Repeat with remaining half of first 5 ingredients, and pour into pitcher.

Stir half-and-half into coffee mixture, and garnish, if desired. Serve immediately.