Melt baking chocolate with 2 cup milk in saucepan over medium heat, stirring constantly. Cook and stir, just until mixture boils; remove from heat. Combine sugar, flour, corn starch and salt. Blend egg yolks with remaining 1 cup milk; add to dry ingredients. Blend into chocolate mixture in saucepan. Cook over medium heat, stirring constantly, until mixture boils; boil and stir 1 minute. Remove from heat; add butter and vanilla. Pour into baked pie shell; press plastic wrap onto filling; cool; chill. Serve topped with sweetened whipped cream, if desired.
Cajun Country -- New Iberia, Louisiana