1 stick butter, unsalted6 tablespoons unsalted butter, room temperature
1/3 cup packed dark-brown sugar
1/2 cup granulated sugar
1 large egg
1 teaspoon pure vanilla extract
1 cup all-purpose flour (spooned and leveled)
1/2 teaspoon baking soda
1/2 teaspoon coarse salt
1 cup semisweet chocolate chips