Preheat oven to 180°C (350°F) and line to baking trays with baking paper on.
Melt the chocolate with butter over boiling water or in the microwave. Let it cool. The mixture should be kinda thick.
Whisk the eggs and sugars until creamy. Sugar should completely dissolve. Whisk with an electric mixer for 5-6 minutes on high speed.
Add melted chocolate and whisk for 1-2 minutes on low speed. The batter should get thicker.
In one bowl mix flour, cocoa powder, baking powder, salt, and baking soda. Add to the chocolate batter and mix with the electric mixer for 30 seconds or until the flour disappears.
Add chocolate drops and combine with a rubber spatula.
Take a tablespoon or an ice cream scoop, and scoop about ½ tbsp of cookie dough on the baking tray. I recommend putting 4-5 cookies on one baking tray. Bake for 12 minutes.
Take cookies out of the oven, sprinkle with extra sea salt (optional) and let cool on the baking tray for another 10-12 minutes.