Brown Butter Chocolate Chip Cookie Bars

Steps:

1. <ol>
2. <li>Preheat oven to 350F &amp; line and 8x8 baking pan with parchment paper &amp; make sure your egg is at room temperature.</li>
3. <li>Brown the butter.&nbsp; In a medium saucepan over medium heat, melt the butter until bubbly &amp; stir constantly until the butter starts to turn amber colored with a fragrant, nutty scent.&nbsp; Remove the browned butter into a bowl &amp; let cool for 5 minutes.</li>
4. <li>In a medium mixing bowl, whisk the flour, cornstarch, salt, &amp; baking soda until combined.</li>
5. <li>In a large mixing bowl or bowl of a stand mixer with electric mixer, mix the browned butter with the sugars until creamy &amp; light in color.</li>
6. <li>Add the egg, egg yolk, &amp; vanilla to the butter sugar mixture, &amp; mix again until combined.</li>
7. <li>Add the dry ingredients to the egg mixture &amp; mix until just combined while leaving a few flour streaks which is OKAY.</li>
8. <li>Fold in the semi sweet chocolate chips, &amp; spread the cookie dough into the prepared baking pan, evenly.</li>
9. <li>Top the cookie dough with more chunks of dark or milk chocolate &amp; bake the cookie bars for 25-30 minutes or until the edges are set &amp; the toothpick comes out mostly clean with a few crumbs on it.</li>
10. <li>Let the cookie bars rest for at least 1 hour before serving. &nbsp;</li>
11. </ol>