Preheat the oven to 350 degrees. Line an 8x8 baking dish with parchment paper and lightly butter the paper.
In a large mixing bowl combine granulated and brown sugars with melted butter. Mix until everything is well combined and as smooth as you can get it.
Add vanilla and eggs. Mix for 1 minute. Sift in flour and baking powder, mix well.
Toss in one cup of butterscotch chips and mix until they are mixed thoroughly.
Place the batter into the prepared baking dish and bake for 25 minutes.
Use the toothpick test method to check for done-ness. You do not want to over bake these! When there are a few crumbs only clinging to the toothpick they are ready to come out of the oven.
Allow to cool. Remove from the baking dish and cut into 3” squares.
Notes
Cut When Cool: It is important to allow the blondies to cool completely before slicing them as they will be a gooey mess when they are still warm.
Toffee Pieces: Swap the butterscotch chips for toffee chocolate pieces with a change in flavor.
Store with Bread Slice: Storing blondies with a slice of bread helps to retain their freshness as the moisture of the bread gets absorbed from the bread resulting in blondies that will stay fresher for longer!