2 cups all-purpose flour
1/2 teaspoon baking soda
1/2 teaspoon salt
12 tablespoons salted butter, melted
1/2 cup light brown sugar, packed
1/2 cup dark brown sugar, packed
1/2 cup granulated sugar
1 large egg (room temperature)
1 large egg yolk (room temperature)
4 teaspoons vanilla extract
1 1/2 cups semi-sweet chocolate discs or chunks
Preheat oven to 325*F. Line two baking sheets with parchment paper and position oven racks in the middle of oven.
Stir together dry ingredients into a small bowl. Set aside.
In a medium bowl, combine the melted butter and sugars, and stir with a wooden spoon until mixed. Add the egg and yolk and stir until well mixed. Add vanilla, stir to combine.
Add half the flour mixture to sugar mixture, stir until half the flour is mixed in. Add the chocolate and remaining flour, stir to combine. Using a large spoon, divide the dough among the baking sheets (about nine cookies per sheet).
Bake for 17-20 minutes, rotating pans halfway through. Cool for 15 minutes on baking sheet, then transfer to wire rack.