Preheat oven to 350°.

In medium bowl, blend butter and sugar until light and fluffy.

Add eggs, one at a time. Then add vanilla.

In small bowl, mix flour, salt, and baking powder with a fork.

Slowly add flour mixture to butter mixture.

Slowly add milk, blending until just combined.

Grease and flour 9" cake pan.

Pour batter into pan. Bake 23- 27 minutes, or until cake pulls away slightly from edge of pan and toothpick inserted near center comes out clean.