Sift flower, sugar, salt, cream of tartar and baking soda together in a deep bowl.
Cut in butter.
When well blended add milk, vanilla and eggs.
Beat well until mixture is smooth about 5 minutes.
Pour into a greased and floured 8” x 8” baking dish and bake for 20-25 minutes on 400◦F (200◦C).
Let cool for 5 minutes and then remove from pan and cool.
Frost once cooled if desired.