Ingredients
1cupunsalted butter,cut into tablespoon sized pieces
1cuplight brown sugar,tightly packed
¾cupsugar
2eggs,plus 1 egg yolk, room temperature preferred
1tspvanilla extract
2cupsall purpose flour
2tspcornstarch
½tspbaking powder
1tspsalt
⅔cupwalnuts,chopped, optional
½cuptoffee bits,optional
Preparation
Preheat oven to 350 degrees F. Line a 9×9-inch metal baking pan* with parchment paper or lightly grease and flour.
Place butter in a medium-sized saucepan and cook over medium heat until melted. Once melted, turn up heat just a notch above medium and continue to cook, stirring constantly as it pops and sizzles.
Once the popping slows and the butter begins to turn brown, remove from heat and pour into a large heatproof bowl.
Allow browned butter to cool for at least 20 minutes before proceeding.
Once butter has cooled, add sugars and stir well.
