Melt butter in a sauce pan. Have cocoa powder and sugar ready in mixer bowl. Once butter is melted and foaming, pour over coca/sugar and mix until incorporated.
Add vanilla and eggs until fully incorporated.
Add salt and flour and mix again until incorporated.
Spread in 1⁄2 sheet pan and smooth the top. Cover with chopped walnuts.
Bake in 350-degree oven for 11 minutes, turn, then another 11 minutes.
Keyword brownie, Dark Chocolate Walnut Brownie, Forthright, Forthright Austin