Step 1

In a medium saucepan, whisk together sugar, cornstarch, and salt. Gradually whisk in the milk. Cook over medium heat, stirring constantly, until the mixture thickens and begins to boil. Continue boiling, while whisking constantly for 1 minute. Remove from the heat.

Step 2

Lightly whisk the egg yolks in a glass measuring cup and then slowly drizzle half of the hot milk mixture into the egg yolks while whisking constantly.

Step 3

Add the egg mixture to the saucepan. Return to a boil while whisking constantly for 1 more minute; remove from heat. Stir in butter and vanilla.

Step 4

Pour the pudding into a serving dish or individual dessert dishes. Cover (place saran wrap directly on the surface of the pudding to prevent a film from forming) and refrigerate for about 1 hour or until chilled. Store covered in the refrigerator until ready to serve.