These adorable monster brownies are tricked out with loads of treats from frosting to edible cereal eyeballs!

Why this recipe works
Since monster brownies are a kid-friendly Halloween recipe, as well as one where most of the effort should go into the decorating process, we took quite a few shortcuts to make them easier to prepare.
A brownie box mix, prepackaged cookie icing, and decorator gel make them a lot more manageable. Monster brownies are a fun Halloween dessert that kids can have full creative freedom over. Set up a station with all sorts of goodies to choose from and see what they come up with!

Ingredients you will need
Get all measurements, ingredients, and instructions in the printable version at the end of this post.

Ingredient Info and Substitution Suggestions
BROWNIES – I kept the brownie prep nice and simple by using a box mix, as most of the work will be put into decorating. Here I used Ghirardelli double chocolate brownie mix. You can of course make homemade fudge brownies if preferred!
EYES – The eyeballs on these monster brownies are made with white chocolate dipped cereal topped with a mini chocolate chip. You can just as easily substitute with candy eyeballs to make the process quicker.
ICING – Again, to make things quicker, I used cookie icing, which you can typically find in the baking aisle at the grocery store. Or, substitute with homemade royal icing if you are willing to put in the effort! To add fine lines, such as hair, eyebrows, or smiles, use black decorator gel.
DECORATIONS – Get creative with the edible decorations here! I used various cereals to decorate – Cocoa Puffs, Cheerios, Captain Crunch All Berries, and Oreo Puffs. Pretzels, cookies, nuts, or assorted candies are also great options to decorate with.
How to Make Monster Brownies
These step by step photos and instructions are here to help you visualize how to make this recipe. You can Jump to Recipe to get the printable version of this recipe, complete with measurements and instructions at the bottom.
- 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 the Brownies
- 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.

Frequently Asked Questions & Expert Tips
If you can’t find the prepackaged royal icing colors you are looking for, but are able to get your hands on the white icing, you can simply color it yourself with a bit of gel food coloring. The icing from the bag dried much smoother, so I would definitely recommend buying the colors you want over mixing it yourself. Alternatively, you can use the frosting method I use in my easy decorated sugar cookies recipe by simply warming up a tub of store bought frosting until it’s thinned enough to spread. This method won’t harden, however, so keep that in mind.
Store your brownies in an air-tight container, seperated by layers of parchment paper. Keep at room temperature for up to 4 days.

Serving Suggestions
I think these monster brownies would be extra adorable wrapped in cellophane gift baggies and tied with a Halloween ribbon to use as party favors.
Wrapping them in cellophane will work well if you use royal icing (such as the Betty crocker icing listed in the recipe card), as it hardens when dry. If you also use the decorator gel, do note that it does not harden, so you may want to place the brownie in a pastry box instead.
More Halloween Recipes
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Monster Brownies
IMPORTANT – There are often Frequently Asked Questions within the blog post that you may find helpful. Simply scroll back up to read them!
Print It Pin It Rate ItIngredients
- 18 ounce brownie mix prepared according to box directions
- Cookie Icing in desired colors
- 2 cups Cereal such as Cheerios, Cocoa Puffs, or Captain Crunch All Berries
- Mini chocolate chips
- Pretzel sticks
- Red and black decorator gel
- ¼ cup powdered sugar
- milk
Things You’ll Need
- Offset icing spatula or spoon
Before You Begin
- The nutrition count on each individual brownie will vary greatly depending upon the amount of decorations you add and how large or small you cut your brownie. The nutrition facts listed here only includes a standard sized baked brownie, please refer to your individual ingredients for more accurate nutrition information.
- The number of brownies you yield will again vary depending upon the shapes you cut them in to. When I make these, I like to use two brownie mixes so I have more wiggle room to be creative.
- You can use any prepackaged cookie icing such as Great Value, Wilton, or Betty Crocker icing. It should be royal icing, not regular frosting (though you can use regular frosting if preferred).
Instructions
- 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.
Expert Tips & FAQs
- Store your brownies in an air-tight container, seperated by layers of parchment paper. Keep at room temperature for up to 4 days.
Nutrition
The recipes on this blog are tested with a conventional gas oven and gas stovetop. It’s important to note that some ovens, especially as they age, can cook and bake inconsistently. Using an inexpensive oven thermometer can assure you that your oven is truly heating to the proper temperature. If you use a toaster oven or countertop oven, please keep in mind that they may not distribute heat the same as a conventional full sized oven and you may need to adjust your cooking/baking times. In the case of recipes made with a pressure cooker, air fryer, slow cooker, or other appliance, a link to the appliances we use is listed within each respective recipe. For baking recipes where measurements are given by weight, please note that results may not be the same if cups are used instead, and we can’t guarantee success with that method.
Amanda Davis
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Design a cake online says
This are the cutest monsters i’ve ever seen :). I showed the post to my 6 year old, and we are going to try and bake them tomorrow. Wish us luck!
Kelli says
Amanda these brownies are adorable! I have been wanting to make them forever, and I finally did this weekend! I posted about them {with a link back to you} here: http://the-wilson-world.blogspot.com/2011/10/monster-brownies-halloween-costumes.html Thanks for the awesome inspiration! My boys are going to love them at our Halloween party tonight:)
Amanda Formaro says
Too cute Kelli!!
theresa says
Hi, are the icings betty crocker available in canada. they are so nice brownies!!!!
Amanda Formaro says
I’m not sure Theresa, maybe check the Betty Crocker website?
Emma @mummymummymum says
i LOVE those! I can’t wait to make them with my children!
Found you at Red Ted Art. xx
Amanda says
They were so cute Melinda!
Josh and Melinda says
These are AWESOME! I didn't do you justice, but tried my hand this Halloween and blogged about it!
Amanda says
Thanks ladies!
Loved the brownie pics Anon! So cute!
marla – I know right, so fun to be on Betty Crocker! Loved yours too!
marla {family fresh cooking} says
Amanda, I love that we are both on the Betty Crocker site for our cereal Halloween creations. Your treats are so freaking cute! xo
Anonymous says
What fun. The kids loved making these brownies! You can see some pictures on my blog:
http://kimhindsphotography.wordpress.com/2010/10/23/monster-brownies-quick-run-and-hide/
Can't wait to try something else! thanks for the wonderful ideas AND the well written info. (funny stuff)
Amanda Padgett says
Love this idea, thank you!! We will be doing this next week for sure!
Clicked over from Living Locurto.
Minny says
Really cute Amanda!! I don't have the patience anymore to do much cookie decorating. When my kids were little, we decorated cookies at holiday time, but I just don't have the patience to do it now.. blame it on "ole timer's" LOL
Amanda says
Thanks everyone!!
I saw them Ruth, they were SO cute!
Ruth says
My boy and I have made these twice now! They are awesome!
Meaghan Frubalee says
okay, ummmmmm, these are EPIC! i cannot believe how awesome this is… they are…these are…
for 2:30 AM, that sounds right.
my point simply is, when it is next NOT 2AM then i am going to make these. it's first on the list of things to do, these are great! thanks so much for posting them, love your blog!!
-m
http://clutzycooking.blogspot.com/
To Mommies and Beyond says
Hello there. I am a new follower via Blog Hopping.Please visit @ http://www.mommiesandbeyond.com
Have a great weekend!
Melissa says
These are amazing! WOW!! What a clever idea!!!! I love these monster brownies! Thanks for sharing!!!!!
Mags says
I love it when your "crafty" carries over into your cooking. Those monsters are…umm…adorable?
Kim says
These are some of the cutest things I've seen all season – fabulous job!
Biz says
You are so creative Amanda! Love these – I may steal it for my office party – I am dressing up as Paula Dean!
Hope all is well with you.