Preheat oven to 325 degrees F. Line a 13 x 9 baking dish with parchment paper then spray with Pam with Flour.
Melt chocolate chips and butter in a medium pot over low heat. Stir until all melted and smooth. Remove from heat.
Add in both sugars and stir until combined. Mixture will be grainy. Stir for 5 minutes allowing it to cool slightly.
Stir in eggs one at a time.
Mix in flour, vanilla, salt and black walnuts.
Pour into the prepared pan and bake for 40- 45 minutes.
Cool completely. Poke holes in the brownies and pour 2 ounces of Black Walnut Sweetshine over the brownies.
Prepare the Frosting
Melt the butter, cream cheese, heavy cream and chocolate over a double boiler. When completely melted, remove from heat and let cool for 10 minutes. Stir in the powdered sugar and Black Walnut Sweetshine.
Pour over the prepared brownies and smooth. Top with more Black Walnuts.