State Fair Ribbon Fudge Brownies
You can substitute 3/4 cup semisweet chips and 1/4 cup bittersweet chips for the chocolate, if desired.
You can substitute pecans for walnuts and bittersweet chocolate chips for semisweet, if desired.
If you use all bittersweet chocolate, or more bitter than semi, you won't get the shiny crackly crust. The secret to a shiny crust is to have a higher sugar to fat ratio. Bitter and unsweetened chocolate have more fat.
Cut with a plastic knife when cool. Brownies don't stick to plastic for some reason. Edges might be harder, so start with a regular knife.