Start with making the brown butter. Heat butter in a saucepan on medium heat, first it will melt then it will foam. Continue stirring for the next 5-8 minutes. You'll know it's ready when the bits on the bottom of the pan become golden brown and a nutty aroma has filled the room. Transfer into a glass cup and allow to cool to room temperature.
3/4 cups butter
In a large bowl, add the cooled brown butter and brown sugar. Whisk for about 2 minutes until well combined.
1 cup dark brown sugar
Add in egg, egg yolk, and vanilla. Continue whisking.
1 egg, 1 egg yolk, 1 tbsp vanilla
Add in flour, baking soda, and salt. Using a spatula, fold until a soft cookie dough forms.
2 cups all-purpose flour, 1 tsp baking soda, 1/4 tsp salt
Toss in chopped pecans and white chocolate chips. Mix in a few times.
3/4 cups pecans, 1/2 cup white chocolate chips
Scoop cookie dough using a 2oz cookie scooper onto your baking tray lined with parchment paper. Scoop 6 cookies per tray.
Bake for 10-11 minutes, or until the cookies are a light golden brown around the edge and slightly puffy in the middle.
Top with flakey sea salt (optional but recommended!) and enjoy.