Preheat your oven to 350°F (175°C) and grease a 9-inch round cake pan with butter or cooking spray.

In a mixing bowl, cream together the softened unsalted butter and granulated sugar using an electric mixer on medium speed for 1-2 minutes.

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

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

Gradually add half of the dry flour mixture to the butter mixture, mixing on low speed, then add half of the milk, continuing to mix until smooth.

Repeat with the remaining dry ingredients and milk, being careful not to overmix.

Pour the batter into the prepared cake pan and bake for 26-32 minutes, checking for doneness with a toothpick.

Once baked, allow the cake to cool in the pan for about 10 minutes before transferring it to a serving plate. Dust the top with confectioner's sugar.