Preheat oven to 350 degrees. Place melted butter in bowl add cocoa. Mix until well blended. Add sugar and mix well. Add eggs one at a time, mixing after each one. Add flour, vanilla, and salt. Stir just until mixed. Stir in chocolate chips. Put in greased 9 x 13 pan. Bake at 40 minutes
Not a NESTLÉ®-tested recipe.