Preheat oven to 350.
Add the flour, salt, cocoa powder, sugar, baking powder, cornstarch, and chocolate chips stir to combine.
Pour in the stout, oil and 2 tbs of the melted butter, stir until just combined, some lumps are expected.
Pour into a loaf pan that has been sprayed with cooking spray. Pour the remaining butter over the top.
Bake at 350 for 40 to 45 minutes or until a tooth pick inserted in the center comes out with just a few crumbs on it. Allow to cool before slicing.