In a stand mixer fitted with whip combine butter and both sugars. Blend on medium high speed until fully incorporated. Add eggs and vanilla and whip to combine. Change to paddle attachment – whip will clump too much and won’t handle the chocolate chunks as well. In a medium bowl combine flour, baking soda and salt. Add dry mix into butter mix and do a quick mix to start to blend. Add chocolate chunks. Mix until combined and all flour is incorporated.When ready to bake scoop onto baking sheets lined with parchment an bake 10 – 14 minutes at 350°F until golden brown. Cool on wire racks. Store in airtight container for up to four days – if they last that long.