1. Place cornstarch in a small saucepan. Gradually add milk, stirring with a whisk until blended. Stir in coffee. Cook over medium-high heat 1 minute or until mixture just begins to simmer. Remove from heat; stir in chocolate chips. Cook, stirring constantly, over medium-high heat until mixture comes to a boil; cook 1 minute until mixture is smooth and slightly thickened. Remove from heat; stir in powdered sugar, cinnamon, and vanilla extract.
2. Spoon 1/2 cup ice cream into each of 8 dessert bowls. Top each serving with 2 1/2 tablespoons sauce and 1/2 tablespoon pine nuts.