Melt the butter and chocolate in the microwave, stirring occasionally, until homogenous. Then you should add the cocoa and the chocolate cream mass and stir again so that there are no lumps.
Then beat the sugar and eggs with a whisk or mixer, add flour and salt, mix with a wooden spatula.
Combine both mixes and mix, you get a thick dough, add chocolate chips.
Pour the dough into a puffed parchment pan and bake for 30 minutes at 350 degrees. You may need a little less or more time, check with a toothpick if the brownies are ready. When the cake is slightly cooled off, remove it from the mold and cut it in portions.