Preheat your oven to 350°F (175°C). Grease and flour a 9-inch round cake pan.

In a large mixing bowl, cream the softened butter and granulated sugar together until light and fluffy, about 3-5 minutes.

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

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

Gradually add the dry ingredients to the butter mixture, alternating with the milk. Start and end with the flour mixture, mixing until just combined.

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

Bake in the preheated oven for 40-45 minutes, or until a toothpick inserted in the center comes out clean.

Allow the cake to cool in the pan for 10 minutes before transferring it to a wire rack to cool completely.