Line 2 large baking sheets with silicone baking mats. Set aside.
Use a stand mixer to beat the butter and brown sugar together until smooth, about 3 minutes.
Scrape down sides, then beat in eggs and vanilla.
Add in flour, baking soda, baking powder, and salt.
Mix until just combined, then mix in walnuts and chips.
Pack 1/2 cup measuring cup with dough to make 8 scoops - dough is sticky, that’s ok!
Roll into balls, then place onto the prepared baking sheets (4 on each sheet).
Chill for 60 minutes.
Preheat oven to 400 degrees F.
Working with one pan at a time, bake the cookies for 15-20 minutes*.
Remove from oven and let them cool on the baking sheet for 15 minutes before serving.
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