- Combine flour, sugar, and salt in a medium-sized heavy-duty pan using a whisk.
- Separate the eggs and set the egg whites aside
- In a medium bowl, add cold milk, cornstarch, and egg yolks. Whisk together until well combined.
- Stir the milk mixture into the flour mixture and whisk until well combined.
- Cook over medium heat, stirring constantly, until smooth and thickened. Mixture should coat the back of a spoon and be a thick consistency.
- Let mixture come to a boil for one minute, stirring continually.
- Remove from heat and stir in vanilla extract.