1 stick unsalted butter, cold & cubed
In the bowl of electric mixer fitted with paddle attachment, cream together the butter and sugars until well blended and fluffy. Add eggs, one at a time and beat until well incorporated.
Into the bowl, add the flour, salt, baking soda, baking powder and mix until just combined. Gently fold in chocolate chips/chunks. Cover the bowl with plastic wrap & chill dough for at least an hour.
While the dough is chilling, preheat oven to 375 degrees.
Scoop out 2 oz balls of dough and place each on sheet pan lined with parchment paper. Bake 15-20 minutes on a rack in the upper third of the oven until lightly browned. (Be sure not to bake these on the bottom rack in the oven – the recipe has a large amount of brown sugar that could cause the bottoms to burn).