Ingredients
Equipment
Method
- Preheat your oven to 350°f (180°c). Grease and line an 8" (20cm) non-stick baking pan. Leave the parchment extending over the sides to form a sling. You can secure it with binder clips if you wish.
- Place the butter in a medium saucepan over medium heat. Cook until melted, then continue cooking, swirling the pan often and stirring with a whisk, until the butter foams, turns golden brown, and has a nutty aroma. This should take 3-4 minutes.
- Weigh out 110g of the brown butter into a medium bowl. Let it cool for 15-20 minutes so it does not scramble the eggs.
- Add the brown sugar and granulated sugar to the bowl with the brown butter and mix to combine.
- Add the egg and whisk well for 1-2 minutes, or mix with an electric mixer, until the mixture has lightened in color and thickened.
- Add the vanilla and mix well.
- Add the flour, baking powder, and salt. Mix with a rubber spatula until some flour streaks remain. This prevents overworking the dough.
- Add the chocolate and mix to incorporate with a rubber spatula.
- Press the dough into the prepared pan, smoothing it down with an offset spatula. You can add extra chocolate chunks to the top if desired.
- Bake for 20 to 22 minutes, until the top is golden brown and set, and the edges have started to firm up. For crispier edges, bake a little longer.
- Remove the bars from the oven and let them cool in the pan on a wire rack. Use the parchment paper sling to lift them out of the pan. Cut into pieces with a sharp knife.
- Store cookie bars in an airtight container at room temperature for up to 3 days.
Notes
The recipe uses an initial quantity of butter, then a smaller measured amount of brown butter. The larger initial amount accounts for water loss during browning. If you are scaling the recipe, note that pan sizes and cooking times in the method do not scale automatically; only the ingredient quantities do.