Butterscotch Chewies

Preheat oven at 350 degrees and grease a 9×13-inch baking dish.
Add brown sugar and melted butter to a large bowl and mix until smooth.
Add eggs and vanilla and mix until fully combined.
Sift together flour, baking powder, and salt and mix into wet ingredients.
Stir in butterscotch chips and nuts until just combined.
Transfer to prepared baking dish and bake for 55-60 minutes, covering with foil for the last 15 minutes.
Allow Chewies to fully cool before slicing.