Mom'S Chocolate Pie - cooking recipe

Ingredients

3/4 c. sugar
2 Tbsp. cocoa
2 Tbsp. (heaping) flour
dash of salt
2 egg yolks
1 c. Pet milk
1 c. whole or 2% milk
1 tsp. vanilla
1 Tbsp. butter
1 pie crust, baked
1 small carton Cool Whip

Preparation

Beat egg yolks.
Add milk gradually and mix well.
Gradually stir into dry ingredients.
Cook in medium size saucepan, on medium heat, until thick, stirring constantly.
Remove from heat and add vanilla and butter; stir well.