These Christmas brownies are super simple, chewy and fudgy, with a deep chocolate flavor. I decorated them with royal icing and some silver and gold sprinkles.
Fold in chocolate chips and walnuts. Pour the brownie batter into the prepared pan. Bake in the middle of your oven for 30-35 minutes, until a toothpick inserted in the middle comes out with a few crumbs and the edges are set. Let cool completely.
Using a very sharp knife, cut your completely cooled brownies into 16 squares. Fill a piping bag with frosting, cut a small hole in the corner of the bag, and pipe the top of your brownies with Christmas tree shapes and snowflakes.