These oversized cookies are chewy and thick, like many of the chocolate chip cookies sold in gourmet shops and cookie stores. They rely on melted butter and an extra yolk to keep their texture soft. These cookies are best served warm from the oven, but will retain the proper texture even when cooled. To ensure the proper texture, cool the cookies on the cookie sheet. Oversized cookie sheets allow you to get all the dough into the oven at one time. If youre using smaller cookie sheets, put fewer cookies on each sheet and bake them in batches.
2 cups plus 2 tablespoons all-purpose flour
1/2 teaspoon baking soda
1/2 teaspoon salt
12 tablespoons (1-1/2 sticks) butter, melted and cooled until warm
1 cup light or dark brown sugar, packed
1/2 cup granulated sugar
1 large egg plus 1 egg yolk
2 teaspoons vanilla extract
1-1/2 cups semi-sweet chocolate chips
1. Adjust oven racks to upper- and lower-middle positions and heat oven to 325 degrees. Line two large cookie sheets with parchment paper.
2. Whisk flour, baking soda, and salt together in medium bowl; set aside.
3. Either by hand or with electric mixer, mix butter and sugars until thoroughly blended. Beat in egg, yolk, and vanilla until combined. Add dry ingredients and beat at low speed just until combined. Stir in chips to taste.
4. Roll scant 1/4 cup dough into ball. Holding dough ball in fingertips of both hands, pull into two equal halves. Rotate halves 90 degrees and, with jagged surfaces facing up, join halves together at their base, again forming a single ball, being careful not to smooth doughs uneven surface. Place formed dough onto cookie sheet, leaving 2-1/2 inches between each ball.
5. Bake, reversing position of cookie sheets halfway through baking (from top to bottom and front to back), until cookies are light golden brown and outer edges start to harden yet centers are still soft and puffy, 15-18 minutes. Cool cookies on sheets. When cool, peel from parchment.
From Americas Test Kitchens.