2 and 1/4 cups all-purpose flour
1 teaspoon baking soda
1/2 teaspoon baking powder
1 and 1/2 teaspoons cornstarch
1/2 teaspoon salt
3/4 cup butter, melter
3/4 cup packed light or dark brown sugar
1/2 cup granulated sugar
1 large egg + 1 egg yolk
3 teaspoons pure vanilla extract
1 and 1/4 cups dark chocolate chips

2 and 1/4 cups all-purpose flour 1 teaspoon baking soda 1/2 teaspoon baking powder 1 and 1/2 teaspoons cornstarch 1/2 teaspoon salt 3/4 cup butter, melter 3/4 cup packed light or dark brown sugar 1/2 cup granulated sugar 1 large egg + 1 egg yolk 3 teaspoons pure vanilla extract 1 and 1/4 cups dark chocolate chips

Preheat oven to 325°

Whisk the flour, baking soda, cornstarch, and salt together in a large bowl. Set aside.

In a medium bowl, whisk the melted butter, brown sugar, and granulated sugar together until no brown sugar lumps remain. Whisk in the egg and egg yolk. Finally, whisk in the vanilla extract. The mixture will be thin. Pour into dry ingredients and mix together with a hand mixer.

Fold in the chocolate chips. The chocolate chips may not stick to the dough because of the melted butter, but do your best to combine them.

Line large baking sheets with parchment paper or silicone baking mats.

Using a cookie scoop, Roll into a ball, place 3 inches apart

Bake the cookies for 12–13 minutes or until the edges are very lightly browned.

The centers will look very soft, but the cookies will continue to set as they cool.