Beat butter, sugar, baking powder, and vanilla in a large bowl with mixer on high 3 minutes or until fluffy.
Add eggs, 1 at a time, beating well after each. On low speed, beat in flour in 3 additions alternately with milk in 2 additions, just until blended, scraping sides of bowl as needed.
Bake at 350 degrees for 35 minutes or until toothpick inserted in center comes out clean. Cool in pans on a wire rack for 10 minutes.
