Preheat the oven to 325 degrees. Spray a 13 x 9 baking pan with cooking spray or butter and flour, if preferred.

Whisk the melted butter and sugars in a large bowl until combined.

To the sugar add the eggs and vanilla and mix well.

Using a rubber spatula, fold the dry ingredients (flour, salt, baking soda) into the egg mixture until just combined; do not overmix.

Fold in the chocolate chips and turn the batter into the prepared pan, smoothing the top with the spatula.

Bake until the bars are golden brown and they are slightly firm to the touch, aabout 20-25 minutes.

Cool for about 10 minutes and then cut and serve.