The recipe is from More Make a Mix Cookbook:
2 1/3 cups sugar
1 3/4 cups cornstarch
3/4 teaspoon salt
Combine all ingredients. Store in container with tight fitting lid.
To use: Combine 2/3 cup mix with 2 3/4 cups milk in a saucepan.
Stir and cook till mixture thickens and begins to boil. Add 2 beaten egg yolks now and cook one more minute. Remove from heat. Add 2 tablespoons butter and 1 1/2 teaspoon vanilla. Let cool.
Cook's Notes: The egg yolks can be omitted. If you are making pie filling, use 1 1/2 cups milk. Flavorings can be added to change the taste.