Preheat your oven to 375°F (190°C) and line two baking sheets with parchment paper. Set them aside for later.
In a medium bowl, combine the flour, baking soda, baking powder, and salt. Give it a quick whisk and set aside.
In a large mixing bowl, cream the softened butter, granulated sugar, and light brown sugar together until smooth and fluffy.
Add the egg and vanilla extract to the butter mixture, beating until the mixture is light and well-combined, about 1 minute.
Gradually fold the dry ingredients into the wet mixture until a dough forms.
Stir in the dark chocolate chips and ground black sesame seeds, mixing until evenly distributed.
Scoop about 2 tablespoons of dough per cookie (or adjust to your preferred size) and roll into balls. Arrange them evenly on the prepared baking sheets, leaving enough space between each cookie.
Bake for 8-10 minutes, or until the edges are just starting to turn golden. The centers will still look soft — that’s perfect!
Let the cookies cool on the baking sheet for 5 minutes before transferring them to a wire rack to cool completely.