Preheat your oven to 350°F (175°C). Grease and flour a 9x13 inch baking pan.

In a mixing bowl, cream together the butter and sugar until light and fluffy.

Add the eggs one at a time, beating well after each addition. Mix in the vanilla.

In another bowl, combine the flour, baking powder, and salt.

Gradually add the dry ingredients to the creamed mixture alternately with milk, starting and ending with the flour mixture.

Pour the batter into the prepared pan and spread evenly.

Bake for 30-35 minutes or until a toothpick inserted into the center comes out clean.

Let cool in the pan for 10 minutes before transferring to a wire rack to cool completely.

Serve with fresh berries if desired.