• Preheat oven to 350 degrees F. Line a 9-inch x 9-inch baking dish with parchment paper and set aside.
• Combine brownie mix, eggs, and water in a medium-sized mixing bowl.
• Add 1-2 drops of black gel food color. Mix well until combined.
• Transfer the mixture to the prepared brownie dish. Tap on the counter top lightly once or twice.
• Transfer to a preheated oven and bake for 15-20 minutes or until a toothpick inserted at the center comes out with a few moist crumbs.

Melt Marshmallows

• Place Marshmallows in a large mixing bowl with water. Microwave at a 10-second increment, stirring after every interval to ensure the Marshmallows don't burn and turn into caramel.

Make Spider Webs

• Use your hands to take a small portion of melted marshmallow. Spread them out using your fingers so that they resemble a spider web.
• Place them on the brownies and top with candy eyes for a spookier effect.
• Cut the brownies into squares and serve.