Here’s a quick clipping from a box of some kind, maybe a box of pudding since it’s one of the ingredients. Recipe is typed below along with a scanned copy.
Ice Cream Sauce
Pour 3/4 cup evaporated milk into bowl. Add pudding mix and dash of salt. Beat slowly with egg beater 1 minute. Stir in 3/4 cup light or dark corn syrup. Serve over ice cream or cake.
Easy directions from GENERAL FOODS KITCHENS