Preheat your oven to 350°F (175°C) and prepare a 9-inch round cake pan with butter and parchment paper.

Cream together the softened unsalted butter and granulated sugar in a large bowl until light and fluffy, about 3-5 minutes.

Incorporate the eggs one at a time, beating well after each addition to create an emulsion.

Stir in the vanilla extract until well combined.

Whisk together the flour, baking powder, and salt in a separate bowl, then gradually add to the wet ingredients until just incorporated.

Mix in the milk or heavy cream until you achieve a smooth batter.

Transfer the batter to the prepared cake pan and smooth the top evenly.

Bake in the preheated oven for 40-50 minutes, checking for doneness with a toothpick.

Allow the cake to cool in the pan for 10-15 minutes before transferring to a wire rack to cool completely.

Dust with powdered sugar or serve plain with berries or whipped cream.