1/4 C. soft butter
2 C. sifted XXXX sugar (confectioner sugar)
1/4 t. salt
1 t. vanilla
2 T. cream
1 T. corn syrup

Cream butter until very smooth; then add sugar gradually, creaming thoroughly. Add salt and vanilla. Gradually work in the cream, then the corn syrup to produce a smooth spreading consistency. Spread on cake. Sufficient for two 8 inch layers.

I didn’t have cream so I used Skim milk and frosting still came out great!

This is from The Modern Family Cookbook by Meta Givens (1953)