Chocolate Chip Cookie Bars
In a medium-sized bowl whisk together the flour, baking soda, salt, and cornstarch. Set aside.
Mix Dry Ingredients
In the bowl of an electric mixer combine butter and sugars. Mix on medium for around 2 minutes, until light and fluffy.
Cream Butter and Sugars
Stir in vanilla, egg, and egg yolk, making sure to mix until fully combined.
Add Egg and Egg Yolk
Gently fold in dry ingredients and chocolate chunks until just combined.
Add Dry Ingredients
Pour cookie dough into prepared pan and gently press into an even layer.
Prepare for Baking
Bake the cookie bars just until golden brown. Let the bars cool in the pan on a wire rack for 20 minutes then slice and serve.
Bake and Serve