Preheat oven to 350 degrees.  Line a 9x13 inch baking pan with foil and lightly spray the bottom with cooking spray.  Set aside.

Combine flour, baking soda, and salt in a bowl and whisk to combine.  Set aside.

In a mixing bowl, thoroughly combine brown sugar, white sugar, and melted butter.  Add eggs, one at a time, stirring between each addition, and vanilla.  Add dry ingredients a little at a time until incorporated. Stir in chocolate chips (save a few for the top if desired).  Once dough is thoroughly mixed, press into the prepared baking pan.

Bake for about 25 minutes (all ovens are different, set timer for 20 minutes to start checking on them.  They will bake for 20-30 minutes, but some readers have reported they took longer).  Remove from oven when edges are golden brown and center appears set, but still soft.  Cool completely to room temperature and then cut into squares.