Position the rack in the center of the oven. Preheat the oven to 350°F (180°C). Line two cookie sheets with parchment paper.
In a bowl, combine the flour, baking soda, and salt. Set aside.
In another bowl, mix the melted butter, brown sugar, egg yolks, and vanilla with a wooden spoon until the mixture is thoroughly blended.
Using a wooden spoon, incorporate the dry ingredients and chocolate chips.
Using a spoon, place 2 tablespoons (30 ml) of dough per cookie on the baking sheet, leaving 2 inches (5 cm) between each cookie.
Flatten the dough slightly with your fingers.
Bake one sheet at a time for 11 to 12 minutes (the center of the cookie will be soft but will firm up as it cools).
Let cool on the sheet for a few minutes, then transfer to a wire rack.
