Preheat the oven to 350°F and line a cookie sheet with parchment or a nonstick silicone baking mat. In a large bowl, melt the butter and about 1/2 of the chocolate chips in the microwave using 30 second intervals. Stir after each interval. Melt until the chocolate chips are almost completely melted, then stir until they melt all the way. Add the sugar and stir well. Allow to cool for about 5 minutes.
Add the vanilla, salt, and eggs and stir well. Add the cocoa powder and flour and stir very well to combine. Add the remaining chocolate chips and stir.
Using a 1 1/2 tablespoons scoop, drop the dough onto the prepared baking sheet about 3 inches apart. Bake for 10 to 12 minutes. Allow to cool completely before removing from the pan.