Prepare the brownie mix according to the package instructions and pour into a greased baking pan.

Bake as directed and let the brownies cool completely.

Melt the white chocolate chips and transfer to a piping bag or plastic bag with the tip cut off.

Pipe spiral designs, and use a toothpick to drag lines from the center of the spiral to the edges, creating a web pattern.

Draw a small spider using black gel icing or melted dark chocolate.

Cut into squares and serve these spooky treats!