1. Preheat the oven to 350°F / 175°C. Grease an 8x8" pan with butter and line it with parchment paper.
2. In a medium sized saucepan, add the butter. Place over medium heat and stir occasionally. Once the butter has melted, continue stirring occasionally until the butter begins to foam, turn amber in color, and you can see little dark specs in the butter.
3. Remove the butter from the heat and set aside. While the butter is cooling off, make the homemade toffee bits.

Homemade Toffee Bits

1. Line a baking sheet with parchment paper.
2. Add the butter, salt, and brown sugar to a small saucepan set over medium heat. Continuously whisk the mixture together until it reaches 300°F / 148°C. Immediately pour the mixture onto the lined baking sheet, then smooth and thin it out with a heat safe rubber spatula. Set aside to let it firm up for at least 10 minutes. While you're waiting, make the blondie batter!

Blondies

1. In a medium sized mixing bowl, whisk together the slightly cooled brown butter and brown sugar.
2. Whisk in the eggs and vanilla vigorously for 1 minute.
3. Add in the flour, baking powder, baking soda and salt. Fold the mixture together just until a few flour streaks remain.
4. Use your hands or a rolling pin to break up the toffee into little bits. Reserve some of the toffee bits for topping the blondies.
5. Add chocolate chips and toffee bits into the blondie batter. Fold the mixture together just until no flour streaks remain.
6. Pour the mixture into your prepared pan. Top with extra chocolate chips and toffee bits if desired. Bake for 30-35 minutes, or until the blondies have set and don't jiggle much when shaken.
7. Leave the blondies to cool in the pan to room temperature before cutting. Serve, and enjoy!