Preheat oven to 350 degree F. Line a 9-inch square baking dish with parchment paper. Set it aside.
In a large mixing bowl, combine melted butter with brown sugar. Whisk until combined.
Add in eggs and vanilla extract, whisk until well blended.
Using a wooden spoon or rubber spatula to add in flour, baking powder, and salt. Mix by hand until just combined. Fold in butterscotch morsels.
Pour batter into prepared baking dish. Bake for 38-42 minutes. Cool completely. Slice and enjoy!
Notes
Don’t over mix. I prefer to mix the batter by hand, especially after adding the dry ingredients. Over blending can make blondies tough.
Line your pan with parchment paper. This makes it so much easier to remove the baked blondies from the pan. I use binder clips to hold the parchment paper in place, just be sure to remove them before baking.
Let cool completely. It’s difficult to wait, but these taste best when they are completely cooled.
I recommend cutting blondie bars with a sharp, non-serated knife. Blondies are a littler easier to cut neatly than brownies, but make sure to wipe the knife clean between cuts for perfect edges.