Sift together flour, cocoa powder, baking powder and salt in a
medium bowl. Set aside.
Melt the chocolate in the microwave for about 1 minute. Stir.
Continue to melt in 30 second increments until fully melted and
smooth. Set aside. In a small bowl, whisk the eggs and vanilla. Set
aside.
With an electric or stand mixer with paddle attachment on medium
speed, beat the butter until smooth and creamy - about 1 minute.
Beat in the sugars, scraping down the sides every 10 seconds or so.
The mixture will be granular. Mix in the beaten egg/vanilla until
incorporated. Add the chocolate in a steady stream and beat until
combined. Add the dry ingredients on slow speed. Fold in the
chocolate chips. Do not overmix at any point in this process. Chill
dough for at least 30 minutes.
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