Preheat oven to 350°. Line 2 baking sheets with parchment paper. Set aside. 

Mix butter and both sugars together using a mixer or by hand. 

Add the eggs and vanilla and mix well. 

Stir in flour, baking soda, and salt. Stir until combined. The dough should not be too wet, but if needs a little more flour to be easier to handle, add a tablespoon or two more until it is easier to handle. 

Add the chips and work through. Roll into 24 large balls and place on prepared cookie sheets. 

Bake for 9 to 12 minutes, do not overbake. They will be set, but not brown. Let cool on the baking sheets.