Preheat the oven to 350°F (175°C) and grease a baking pan.

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

In another bowl, mix the wet ingredients: brown sugar, melted butter, eggs, and vanilla extract.

Gradually add the dry ingredients to the wet mixture and stir until combined.

Fold in the butterscotch chips.

Pour the batter into the prepared baking pan and spread evenly.

Bake for 25-30 minutes or until a toothpick comes out clean.

Let cool before cutting into squares.