Preheat oven to 350 degrees. Line two baking sheets with parchment paper. Sift flour, salt and baking soda into a medium bowl. Beat half the butter on medium speed until fairly smooth. Add both sugars and the remaining butter, and beat until well combined, then beat for a few minutes more, until the mixture is light and creamy.

Scrape down sides of the bowl. Add one egg at a time, beating until completely incorporated. Add your dry ingredients and mix on low speed to combine. Fold in chocolate pieces by hand. Note: You might want to sift the small pieces out of the chocolate pieces, so the chunks are a relatively inform size.

Shape dough into balls, using about 2 Tbsp each. Arrange cookies on each pan, leaving space between them. Bake for 10-12 minutes. Ten minutes for more gooey cookies and a bit more if you want golden tops. Remove from oven and allow cookies to cool for a few minutes on the cookie sheets and then move to racks to finish cooling.