Blend milk and vanilla; set aside
Mix shortening until softened.
In separate bowl sift together flour, baking powder, salt, and sugar; mix well
Add dry mix and 3/4 of the milk to shortening. Beat two minutes at 1 bowl cake speed, scraping the side of the bowl often.
Add eggs and remaining milk. Beat one minute more.
Grease and flour pans or use baking spray. Bake at 375ºF
25 minutes for 2 9 inch layers, or
35 minutes for 9x13 inch pan