Preheat the oven to 325 F/162 C.
Separate the chocolate chips evenly into two small bowls. Set one bowl aside and melt the other bowl of chocolate. Use the microwave or a double boiler. In the microwave use bursts of 25 seconds and then stir, etc. Until melted.
Cream the butter and both sugars together in a large bowl, with a mixer. Add the egg and vanilla extract and mix those ingredients in.
Pour the melted chocolate chips into the large bowl with the batter. Mix until just combined.
In a separate medium-sized bowl sift together the flour, cocoa powder, salt, and baking soda. Use a whisk, if you don't have a sifter.
Add the flour mixture to the cookie batter about half at a time and mix to form the dough. Add in the remaining chocolate chips. Mix them in with the mixer or use a wooden spoon.
Use a cookie scoop or two spoons and create dollops of dough and place them on a baking tray lined with parchment paper or a silicone mat. Place them 1 and a half to 2 inches apart. Bake one tray at a time, for 15 to 18 minutes. If you want softer cookies to bake them for 14 to 15 minutes. Allow the cookies to cool on the pan for a few minutes, and then transfer them to a wire rack to cool.
Dust the tops of the cookies with powdered sugar if you like and serve them up. Store them at room temperature in an airtight container or freeze them. Enjoy!