Cream together the butter and the sugars on medium speed until light and fluffy. Add the eggs gradually while mixing to emulsify. Scrape down.
Separately, whisk together the flours, baking powder & salt. Add the dry ingredients and mix on low speed to combine. Scrape down.
Add the Guittard Chocolate Chips and mix gently to incorporate. Refrigerate dough. Roll into 800 gram logs and refrigerate. Slice and separate onto parchment-lined sheet pan.
Bake at 350˚F for about 12 minutes until golden brown. Set to cool, then enjoy.