(Jerry has mentioned this so many times, I know it has to be good.)
1 ¼ c. sugar
3 egg yolks
½ c. cocoa
3 Tbsp. margarine
1/3 c. corn starch
1 ½ tea. vanilla extract
¼ tea. salt
1 baked 9” pie shell
3 cups milk

Combine sugar, cocoa, cornstarch and salt in a heavy sauce pan.  Mix well to remove lumps.  Gradually add milk, stirring until blended.  Cook over medium heat, stirring constantly until mixture comes to a boil and thickens.  Boil 1 minute then remove from heat.  Beat egg yolks until thick.  Gradually stir about ¼ of hot mixture into yolks then return to pot.  Cook 2 more minutes.  Stir in margarine and vanilla and pour mixture into cooked pie shell. Chill and serve with whipped cream.