12tablespoonsbutter1 1/2 sticks, melted and cooled slightly
1cuplight brown sugar
1/2cupgranulated sugar
1large egg
1large egg yolk
2teaspoonsvanilla extract
1 1/2cupschocolate chipsor any kind you prefer
Instructions
Preheat oven to 325 degrees F.
Adjust oven rack to lower-middle position. Line a 13x9-inch baking pan with aluminum foil and spray with nonstick cooking spray.
In a medium bowl, mix flour, salt, and baking soda together; set aside. In a separate large bowl, whisk melted butter and sugars in until combined. To the butter-sugar mixture, add egg, egg yolk, and vanilla; mix well. Using a rubber spatula, fold in dry ingredients until just combined; do not overmix. Fold in chocolate chips. Turn out batter into the prepared pan, pressing into an even, smooth layer with your hands.
Bake until bars are lightly golden brown, slightly firm to the touch, and edges start pulling away from sides of pan, 23-26 minutes. Let cool to room temperature in the pan. To remove bars, lift the foil overhang and transfer to a cutting board. Cut into 2-inch squares and serve.