Preheat your oven to 350°F (175°C).

Grease your 9-inch round cake pan with butter or cooking spray.

In a mixing bowl, whisk together the flour, baking powder, and salt.

In another bowl, beat the softened butter and sugar until light and fluffy.

Add the eggs one at a time, mixing well after each addition, followed by the vanilla extract.

Gradually add the dry ingredients to the butter mixture, alternating with milk. Mix just until combined.

Pour the batter into the prepared cake pan and smooth the top with a spatula.

Bake for 30 minutes or until a toothpick inserted in the center comes out clean.

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