In a medium sized saucepan add the butter and brown it over medium/high heat, takes about 8-10 minutes. When it starts boiling and foaming, give it a swirl here and there to see the color change. Once deep amber color, pour the browned butter into a large mixing bowl. Make sure to scrape down the brown bits as that is what gives all of the flavor. Let it cool down to room temperature in the fridge. Takes about 20 minutes.
240 g butter
Once the butter has reached room temperature add the granulated sugar and brown sugar and with a whisk, whisk it together for 1 minute. Alternatively, mix it together in a stand mixer using the paddle attachment.
100 g granulated sugar, 150 g dark brown sugar
Add the egg, egg yolk and vanilla extract and mix it in until combined.
1 egg, 1 egg yolk, 1 teaspoon vanilla extract
In a separate bowl, stir together flour, baking powder, baking soda, cinnamon and salt. Add the dry ingredients and with spatula mix it together until just combined.
300 g all-purpose flour, ½ teaspoon cinnamon, ¾ teaspoon baking powder, ¾ teaspoon baking soda, ¾ teaspoon salt
Chop the pecans into small pieces. Similar in size to the chocolate chips. Add both the chopped pecans and chocolate chips to the cookie dough and fold them in.
140 g dark chocolate chips, 75 g pecans
Using a large 2 ounce cookie scoop / ⅓ cup (90 g), scoop out 12 cookies and place them on a tray lined with baking paper. Optionally, decorate each cookie dough balls with extra pecans and chocolate chops. Place the prepared cookies in the fridge to chill for 30 minutes.
Meanwhile, preheat the oven at 175ºC / 350ºF and prepare a baking sheet with baking paper. Place 3-4 cookie dough balls per baking tray and bake one tray at a time for 11-13 minutes. Keep the remaining cookie dough balls in the fridge while the others bake.
Once baked, optionally sprinkle with sea salt and let them cool down on the baking tray for 2-3 minutes as they still will be soft when they are done. Use a spatula to lift them onto a wire rack and let them cool down completely.