Meanwhile, in 2-quart saucepan, mix granulated sugar, cornstarch and salt. Gradually stir in half-and-half. Cook over medium heat, stirring constantly, until mixture thickens and boils. Boil and stir 1 minute. Gradually stir at least half of the hot mixture into egg yolks, then stir back into hot mixture in saucepan. Boil and stir 1 minute. Remove from heat. Stir in 2 tablespoons butter and the vanilla.