Preheat oven to 375 degrees F (190 degrees C). Grease and flour a 9x13-inch baking pan.
In a medium bowl, whisk together the flour, baking powder, and salt.
In a large bowl, cream together the butter and sugar until light and fluffy. Beat in the eggs one at a time, then stir in the milk until just combined.
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Gradually add the dry ingredients to the wet ingredients, mixing until just combined.
Pour the batter into the prepared baking pan.
Bake for 30-35 minutes, or until a toothpick inserted into the center comes out clean.