Popular before cream cheese frostings took over in the 1980s.
From a box sold in Nampa, Idaho.
Frosting For Red Velvet Cake
5 Tbsp. regular flour
1 cup milk
1 cup sugar, granulated
1 cup butter
1 tsp. vanilla
Cook flour and milk until thick, stirring constantly.
Let cool until cold.
Cream together butter, sugar, and vanilla.
Add to cold flour mixture; beat until consistency to spread.
When finished, it looks like whipped cream. Beat until it is curly.