Line a baking sheet with parchment paper and set aside. Grate the cold butter using a medium shrewd cheese grater. Keep refrigerated until ready to use.
Whisk together the dry ingredients: the flour, baking powder, baking soda and salt.
In a separate bowl, beat the grated butter with the sugars for 1 minute. Add the beaten eggs and vanilla extract and beat until they combine together. Add the dry ingredients a little at a time and mix with a hand mixer until just incorporated. Mixture will appear lumpy. Fold in chocolate chips and nuts. Chill the dough for 30 minutes before baking. Can be chilled overnight as well. To form cookies, use a large scoop and place the mounds on the parchment lined baking tray. Do not work the dough too much or strive for perfection. They should have nooks and crannies.
Bake for 18-20 minutes in a preheated 375 degree oven. Take them out when the bottom are light golden brown.
Approximate nutrition information is provided as a convenience and courtesy only. You are encouraged to do your own calculations if precise data is required.