Preheat your oven to 350°F and grease a 9-inch cake pan or springform pan.

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

Add the eggs one at a time, beating 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 wet ingredients, stirring until just combined. Do not overmix.

Spread the batter evenly into the prepared pan.

Bake for 30–35 minutes, or until the top is golden and a tester comes out clean.

Cool in the pan for 10 minutes, then transfer to a wire rack to cool completely.

Dust generously with powdered sugar before serving.