• First prepare your brownies and allow them to cool. I refrigerated mine so that I could get nice clean cuts. When your brownies are ready to be cut, slice off the edges. Cut the brownies into different sized rectangles and squares. I cut some of the odd shaped leftovers into triangles too.

Make the Eyes

• It's important to do this step first (after preparing the brownies) to allow adequate time for the glaze to dry. To make the eyes you'll need any variety of Cheerios, some mini chocolate chips, powdered sugar and a little milk. Place the powdered sugar into a small bowl. Using a spoon, stir in some milk, a little bit at a time, until the consistency is good enough for dipping. Start with about a teaspoon and add a couple drops at a time until you get it where you want it.
• Drop a few Cheerios into the glaze coating the cereal. Use a spoon to lift the cereal out of the glaze and place on a wax paper lined cookie sheet.
• Place a mini chocolate chip, upside down, in the center of each glazed Cheerio. Gently press the mini chip to set. Set aside.

Decorate

• Use an icing spatula, a rubber spatula, or the back of a spoon to spread the royal icing over the top of each brownie.
• Gently press assorted cereals into the frosted brownies for the monsters' polka dots. Do so while the frosting is still wet so that your decorations stick.
• Lift the eyes from the waxed paper using a toothpick and gently press onto the frosted brownie. You can use pretzel sticks for arms and legs, and add eyebrows, mouths and hair using decorator gel.