In a large bowl, using a wire whisk, beat the sugar and eggs for 2 minutes, until they are thoroughly combined and the sugar has begun to dissolve.
In a medium microwavable bowl, heat the chocolate chips and butter on high for 1 minute. Stir. Continue to microwave in 30-second intervals until the chocolate and butter are completely smooth and melted. Pour the egg and sugar mixture into the hot chocolate mixture, whisking constantly while you pour. Add the vanilla. Sprinkle the salt and baking powder over the dough. Stir for 1 minute. Add the flour, and stir gently, just to combine. The dough will seem like a thick, sticky batter. Cover the bowl with plastic wrap and refrigerate for at least 2 hours (and up to 1 week).
READY TO BAKE:
Preheat the oven to 325℉. Line two baking sheets with parchment paper and lightly coat with cooking spray.
Shape the dough into ¾-inch balls and place on the prepared baking sheets about 1½-inches apart. Bake 7 to 10 minutes, or until the tops of the cookies are shiny and cracked- watching the cookies closely during the last few minutes of baking time. As soon as the cookies are cracked across the tops, they're done... so quickly take them out of the oven. Let the cookies cool for 10 minutes. Gently slide a spatula underneath to loosen the cookies and then leave them to cool completely on the baking sheets.