Preheat your oven to 350°F (175°C) and prepare your pan by greasing it with butter and dusting it with flour.

In a large mixing bowl, cream together the unsalted butter and granulated sugar using an electric mixer on medium speed for 3-5 minutes until light and fluffy.

Add the eggs one at a time, mixing well after each addition. Blend for another 2-3 minutes until smooth.

In a separate bowl, whisk together the flour, baking powder, and salt. Gradually fold this dry mixture into the wet ingredients using a spatula until just combined.

Pour the batter into your prepared pan, smoothing the top to ensure an even layer.

Bake in the preheated oven for 30-35 minutes, checking for doneness with a toothpick inserted into the center.

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

Dust the cooled cake with powdered sugar if desired. Serve plain or with berries or whipped cream.