Melt butter and chocolate chips over medium heat until combined. Remove from heat , let cool, add the granulated sugar and eggs until combined. This mixture should look smooth and glossy . Stir in flour, cocoa powder, and salt until no lumps remain.
Spoon half this mixture over the cookies and spread to cover completely. Flatten handfuls of cookie dough mixture into small patties over the brownie layer until covered. Cover with rest of brownie mixture and smooth to cover dough layer.
Bake until toothpick or cake tester inserted into center comes out clean, about 55 mins. Let cool before serving.
As always, let me know if you try this recipe. I like it so much I MAY add it to the market menu! Stop by on the 17th and visit to see if I do.