Prepare Your Pan: Preheat your oven to 350°F (175°C). Line a 9-inch square baking pan with parchment paper, leaving extra paper on the sides for easy removal.

Combine Wet Ingredients: In a large bowl, whisk together the melted butter and brown sugar until smooth and glossy for a chewy texture.

Add Eggs and Vanilla: Mix in the eggs one at a time, followed by the vanilla extract, ensuring everything is well combined.

Incorporate Dry Ingredients: Gently fold in the flour, baking powder, and salt with a spatula, mixing until just combined. Be careful not to overmix.

Add Butterscotch Chips: Fold the butterscotch morsels into the batter, ensuring even distribution.

Bake: Pour the batter into the prepared pan and smooth the top. Bake for 35-40 minutes, checking with a toothpick—there should be a few soft crumbs on it.

Cool Completely: Let the brownies cool in the pan, then lift them out using the parchment paper. Slice into squares and enjoy!