In a small bowl, mix first three ingredients together and set aside.
In a medium Sauce pan, whisk milk, and eggs together
Pour dry ingredients into the milk mixture and whisk together. Now add cut butter to your mixture and place on medium low heat stirring constantly. NOTE: At this point, do not walk away or stop stirring. The pudding will scorch and stick into clumps if you do.
Continue stirring scraping sides and bottom until the pudding becomes thick and creamy. It may start to resemble cottage cheese in texture when its ready.
Remove from burner and add vanilla stirring to remove any lumps. Pour into your precooked pie crust. Allow to cool and cover or add meringue. *Keep Refrigerated