1. Place chocolate chips and corn syrup in 4-cup measure. Microwave uncovered on medium (50%), until mixture can be stirred smooth, 1 1/2 to 2 minutes.
2. Stir in milk, liqueur and cinnamon. Microwave uncovered on medium (50%), stirring every minute, until warm, 2 to 3 minutes. Pour into fondue pot or chafing dish to keep warm. If mixture becomes too thick, stir in small amount of milk. Serve with Dippers and fondue forks.