This recipe is from volume 1 of our Dining On A Dime Cookbook.
1 1/2 cups sugar
1/3 cup cornstarch
1/2 tsp. salt
1/3 cup cocoa
2 Tbsp. butter or margarine
3 cups milk
4 egg yolks
2 tsp. vanilla
1 9-inch, baked pie crust
whipped topping
Find it online: https://www.livingonadime.com/best-easy-pie-recipes-homemade/