1Mix sugar and cornstarch in 4-cup microwavable measuring cup. Stir in milk and egg product. Microwave uncovered on High 3 minutes 30 seconds to 4 minutes; stirring after 2 minutes, until mixture thickens and boils. Stir in butter and vanilla.
2Stir chocolate chips into 1 cup of the pudding until melted. Layer vanilla and chocolate puddings alternately in parfait glasses or swirl in serving dishes.