In a medium microwave-safe mixing bowl, combine the chocolate and butter. Microwave on high in 20-second intervals, stirring between each, until the chocolate and butter are melted, about 2 minutes.

In a large mixing bowl, beat the sugars and eggs on medium speed until light and frothy. Add the melted chocolate mixture and vanilla and beat until combined. Add flour, cocoa powder, salt, and baking powder. Stir together with a spatula until mostly combined. Stir in chocolate chips and mix until the batter is well combined. Cover the bowl and chill the batter for 30 minutes.

Preheat the oven to 350°F and line two baking sheets with parchment paper.

Scoop the chilled dough into 2-tablespoon-sized balls and place on the prepared pans about 3 inches apart.

Bake for 8 to 10 minutes or until the cookies have spread and are shiny and cracked. Let cool completely on the pans.