Preheat oven to 350°F (175°C) and line two baking sheets with parchment paper.
Melt butter and chocolate: In a microwave-safe bowl, melt butter and chocolate chips together in 20-second intervals, stirring until smooth. Let cool slightly.
Whisk sugars and eggs: In a separate bowl, whisk together granulated sugar, brown sugar, and eggs for about 1 minute until pale and slightly thickened.
Combine: Add the melted chocolate mixture and vanilla extract to the sugar mixture. Stir until glossy.
Add dry ingredients: Sift in flour, cocoa powder, baking powder, and salt. Fold gently until just combined.
Chill dough: Refrigerate the batter for 30 minutes to allow it to firm up slightly.
Scoop and bake: Use a cookie scoop to drop tablespoon-sized portions onto the baking sheet, spacing about 2 inches apart.
Bake for 9–11 minutes or until edges are set and tops are shiny and crackled. Centers should still look soft.
Cool: Let cookies cool on the baking sheet for 5 minutes, then transfer to a wire rack to cool completely.