Stir shortening just to soften.
Sift in dry ingredients.
Add egg, 1/2 the milk; mix till all flour is dampened.
Beat 2 minutes at medium speed on electric mixer.
Add remaining milk, vanilla; beat 2 minutes longer.
Bake in paper lined 9x9x2 inch pan in moderate oven (375°) about 25 minutes.
Note: If you like, substitute 1/3 CUP salad oil for shortening in Busy day Cake.
When substituting oil, follow method below.
Sift together flour, 1/2 CUP sugar, baking powder, and salt.
Add salad oil, milk, and vanilla; stir till all flour is dampened.
Then beat till satin smooth (2 minutes at medium speed on mixer).
Beat egg till thick and light (3 minutes at high speed on mixer).
Gradually add remaining 1/4 CUP sugar, beating constantly.
Fold egg mixture thoroughly into batter.
Bake as above.