Preheat oven to 350°F. Line a baking sheet with parchment paper, if desired.
Combine the flour, baking soda, and salt in a bowl and mix well. Set aside.
2 1/2 cups all purpose flour, 1 teaspoon baking soda, 1/2 teaspoon salt
In the bowl of an electric mixer fitted with a paddle, cream together the butter, brown sugar, and sugar on medium speed until light and fluffy, about 4-5 minutes.
1 cup unsalted butter, 3/4 cup brown sugar, 1/4 cup granulated sugar
Add the egg, then the vanilla, and continue to mix until evenly blended.
1 egg, 1 teaspoon vanilla extract
Lower the speed and gradually add the flour mixture until fully incorporated.
Turn off the mixer and fold the dark chocolate chips in with a silicone spatula.
2 cups dark chocolate chips
Scoop out the dough by heaping tablespoons and roll into balls. Place the dough balls on the prepared baking sheet about 2 inches apart.
Bake for 12 to 14 minutes, or until the bottoms of the cookies are lightly browned.
Remove the baking sheet from the oven and add a tiny pinch of flake salt onto the top of each cookie, if desired.
Let the cookies cool on the baking sheet for a few minutes before transferring to a cooling rack.
Serve warm with an ice cold glass of milk, if desired.