Big and Chewy Chocolate Chip Cookies

(from America's Test Kitchen)

3 1/3 cups flour
¾ t baking soda
½ t salt
1 cup butter, softened
½ cup sugar
1¼ cup packed brown sugar
1 T vanilla extract
2 eggs
2 egg yolks
2 cups (12-ounce package) semi-sweet chocolate chips

1. Preheat oven to 325. Combine flour, baking soda and salt in large bowl.

2. Beat butter, sugar, and brown sugar in large mixer bowl.

3. Beat in eggs, egg yolks, and vanilla.

4. Gradually beat in flour mixture.

5. Stir in morsels.

6. Drop ¼ cup dough, rolled into balls, onto two parchment-lined baking sheets, about 2½ inches apart.

7. Bake at 325 for 17 to 20 minutes, rotating sheets halfway through (until edges are just golden, centers soft and puffy. Take the cookies out when they look a bit undercooked and let them firm up as they cool on the baking sheet.)

8. Let stand for 10 minutes.