Step 1: Preheat your oven to 350°F (180°C). Butter and flour a 9-inch cake pan, and set it aside.

Step 2: In a large bowl, cream the butter and sugar together until light and fluffy. This should take about 3-4 minutes with an electric mixer.

Step 3: Add the eggs, one at a time, beating well after each addition.

Step 4: In a separate bowl, whisk together the flour, baking powder, and salt.

Step 5: Gradually add the dry ingredients to the wet mixture, beating until well combined.

Step 6: Pour the batter into the prepared cake pan, and smooth out the top with a spatula.

Step 7: Bake for 35-40 minutes, or until a toothpick inserted into the center of the cake comes out clean.

Step 8: Allow the cake to cool in the pan for 10-15 minutes before transferring it to a wire rack to cool completely.

Step 9: Serve warm with a dollop of whipped cream or a scoop of vanilla ice cream, if desired.