Preheat your oven to 350°F (175°C) and grab a 9-inch square baking pan. In a large mixing bowl, combine your brownie mix with eggs, water, and oil as per the package instructions. Stir until just combined and pour the batter into the prepared pan. Bake for about 25 minutes or until a toothpick comes out with a few moist crumbs.

Once baked, let the brownies cool in the pan on a wire rack for at least 30 minutes.

Spread a generous layer of dark purple frosting evenly across the top using a large offset spatula.

Carefully place 9 Peep Ghosts on top and sprinkle colorful Halloween-themed sprinkles and candy eyeballs generously.

Once decorated, slice the brownies into square pieces and serve on a festive platter.