Preheat the oven to 350°F (175°C). Grease and line a baking pan with parchment paper.

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 until smooth.

Gradually add the dry ingredients to the wet ingredients and mix until just 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 inserted in the center comes out clean.

Allow to cool before cutting into squares.