Preheat your oven to 350°F (175°C). Grease a 9×9-inch baking dish.

In a bowl, whisk together flour, baking powder, granulated sugar, and salt.

In another bowl, cream softened butter with brown sugar until fluffy. Add eggs one at a time, followed by milk.

Gradually combine dry ingredients with wet ingredients until just mixed.

Pour half of the batter into the prepared dish, sprinkle half of the remaining brown sugar over it, then add the rest of the batter on top.

Bake for 30-35 minutes or until a toothpick comes out clean.