Cream the butter with the brown sugar and the granulated sugar with a paddle attachment or with a hand mixer until smooth. This will take 3-4 minutes. Scrape the bowl as needed.
¾ cup butter, ¾ cup brown sugar, ⅓ cup granulated sugar
Add in the room temperature eggs one at a time, mixing on low speed until fully incorporated. Keep scraping the sides of the bowl as necessary.
2 eggs
Turn the mixer to low speed and add in the the flour, corn starch, baking soda, baking powder, and salt and mix just until combined! DO NOT OVER MIX!
2 & ⅔ cup flour, 2 tablespoon corn starch, ¾ teaspoon baking soda, ½ teaspoon salt, ¼ teaspoon baking powder
With the mixer still on low, add in the chocolate chips and the walnuts and mix just until combined. If you are using a hand mixer, stop and fold them using a spatula.
1 & ½ cup semi sweet chocolate chips, 1 & ½ cup walnuts
Divide your dough into 7 large cookie dough balls (about 6.3 ounces each) and place them on a plate or baking sheet and place them in the fridge to chill for 30 minutes or up to 24 hours.
Once you are ready to bake your cookies, preheat the oven to 400F, then line your baking sheet with parchment paper or a silicone mat.
Transfer the cookies onto the prepared baking sheet, place about 4 per large baking sheet and bake in the preheated oven for 11-13 minutes.
Allow the cookie to cool on the baking sheet for 10 minutes and then transfer to a cooling rack to cool down some more. Enjoy these cookies either warm with a cup of milk or cold with a cup of hot tea!