Brown the butter. Melt the butter in a medium sized pan over medium heat. Once it melts, it will crackle, then become foamy – continue mixing the butter while this happens to prevent burning. The butter will go from melted to golden brown quickly, and you’ll know it’s almost done when the aroma of browned butter arrives. The whole process should take about 5 minutes! Once golden, remove from heat and transfer to a glass bowl. Let the butter cool for 30 minutes while you prep on the rest of the recipe.
1/2 cup butter
Preheat oven to 350°F and line a baking tray with parchment paper. Set aside.
In a large bowl, whisk together the cooled butter (it’s ok if it’s still slightly warm), brown sugar, and white sugar.
2/3 cups light brown sugar, 2 tbsp white sugar
Add in the egg and vanilla and whisk until the mixture is light in colour and smooth in consistency.
1 egg, 1 tbsp vanilla
Toss in the flour, baking soda, and salt (if using) and gently fold in until almost combined. Add in the chopped dark chocolate and pistachios and continue to fold until there are no flour streaks showing.
1 1/4 cups all-purpose flour, 1/2 tsp baking soda, 1/2 tsp salt, 1/2 cup roasted and salted pistachios, 1 dark chocolate bar
Spread into prepared pan evenly and add extra pistachios and chocolate on top if desired.
Bake for 20-25 minutes. You'll know it's ready when the edges are golden brown but the center looks puffy and slightly underdone.
When the bars are fresh from the oven, sprinkle with a dash of flakey sea salt.
flakey sea salt
Allow the bars to cool before slicing, and enjoy!