Preheat your oven to 350°F (175°C).

Grease your 9-inch round cake pan with butter or non-stick spray.

In a mixing bowl, combine the flour, baking powder, and salt.

In another bowl, beat the softened butter and granulated sugar until light and fluffy.

Mix in the eggs, one at a time, followed by the vanilla extract.

Gradually add the dry mixture to the butter mixture, alternating with the milk.

Pour the batter into the prepared cake pan, spreading it evenly.

Sprinkle the crushed cornflakes (or nuts) and brown sugar on top of the batter.

Bake in the preheated oven for 30 minutes or until a toothpick inserted in the center comes out clean.

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