Preheat oven to 350℉ and grease a 9x13-inh pan or line it with parchment paper.
In a medium microwave safe bowl, melt the chocolate chips and butter in 30 second increments on high heat. Stir between each trip to the microwave until both the butter and chocolate are melted.
Stir the sugar into the melted chocolate until smooth. Set aside to cool.
In a separate bowl, stir together the flour, salt, and cocoa powder.
When the chocolate mixture has cooled to lukewarm, stir in the eggs and vanilla.
Add the dry ingredients to the bowl and stir to just incorporate. Then stir in the discard until the batter is uniform.
Fold in the chocolate chips, then spread the batter in the prepared pan.
Baked or about 40 minutes or until done to your liking.
Allow to cool completely before cutting and enjoying.
Notes
Use your favorite variety of chocolate. I used milk chocolate for this batch, but dark chocolate would also be fabulous.