Preheat the oven to 350 degrees f.
Line the bottom of a square 8 inch x 8 inch non stick baking dish with parchment paper.
In a large bowl with an electric mixer or stand mixer with paddle attachment; combine brownie mix, water, oil and egg. Mix on medium speed until a smooth brownie batter is formed.
Transfer the batter to the prepared baking pan and spread it evenly around the square pan.
Bake for 30-35 minutes, until a toothpick inserted comes out clean.
Allow the brownies to cool for at least one hour.
Cut the brownie into 12 rectangular shape bars.
In a small bowl, melt the chocolate in the microwave at 15 second intervals until smooth.
Spoon the melted chocolate into a piping bag or bottle with a small icing tip.
Add spell book details to the top of each brownie with the melted chocolate.
Finally, add a candy eye to the top of the brownie with a drop of melted chocolate.