Place dry milk powder, sugar, coffee powder or granules, and cocoa powder in a blender. Cover and blend thoroughly. Store in an airtight container in a cool place. Makes about 1 cup.
To make one serving, place 1 level tablespoon mix in an 8-ounce cup; pour in 3/4 cup vigorously boiling water, stirring to dissolve mixture. Sweeten to taste. Stir with a cinnamon stick or add a dash of ground cinnamon.