Homemade Vanilla Pudding Recipe

In medium saucepan over medium heat heat milk until bubbles form at edges. In a bowl combine sugar cornstarch and salt. Pour into hot milk a little at a time stirring to dissolve. Continue to cook and stir until mixture thickens enough to coat the back of a metal spoon. Do not boil. Remove from heat stir in vanilla and butter. Pour into serving dishes. Chill before serving.