Melt butter and chocolate chips together; let cool slightly.
Whisk together sugars, eggs, and vanilla. Stir into the chocolate mixture.
Sift in flour, cocoa powder, baking powder, and salt; fold to combine.
Chill dough for 15 minutes for easier handling.
Form dough into balls, insert a few extra chocolate chips in the center of each, and place on baking sheet.
Bake for 10-12 minutes until the tops are glossy and cracked.
Let cool on baking sheet for 5 minutes; transfer to wire rack to cool completely.
Prep Time: 25 minutes | Cooking Time: 12 minutes | Total Time: 37 minutes | Kcal: 220 kcal per cookie | Servings: 18 cookies
