These fun Frankenstein Brownies are a spooky treat that’s perfect for Halloween! Rich chocolatey brownies get a monster makeover with bright green frosting and silly candy eyes.
Making these brownies is a blast! I love how easy it is to take a regular brownie and turn it into a festive creation. Just grab some green icing, and you’re ready to scare up some fun! 🎃
Ingredients & Substitutions
Brownie Batter: You can use a homemade chocolate brownie recipe or a box mix. If you want a healthier option, consider using black bean brownies for a fudgy texture. They’re a fun twist!
Food Coloring: Gel food coloring is best for bright colors. If you only have liquid food coloring, use it sparingly, as too much can alter the frosting’s consistency.
Frosting: Buttercream is ideal for decorating due to its thickness, but cream cheese frosting adds a nice tang. Want a vegan option? Use coconut whipped cream or a dairy-free buttercream.
Candy for Eyes: If you can’t find white candy melts, try mini marshmallows or yogurt-covered raisins. Just customize with whatever you have on hand!
How Do I Get My Frosting to Look Great?
Decorating the brownies is all about the frosting technique. First, make sure your brownies are completely cool—this prevents the frosting from melting or sliding off. Here’s how to get neat designs:
- Use a piping bag for precise shapes. A ziplock bag with a corner cut off works too!
- For hair, start from the top edge and use a zigzag motion to create a fun jagged look.
- When creating the eyes, take your time to pipe clean circles with the green frosting. A round tip is helpful!
Don’t be afraid to get creative! Each monster can look different, so have fun with it!

How to Make Frankenstein Brownies
Ingredients You’ll Need:
- 1 batch classic chocolate brownie batter (from your favorite recipe or box mix)
- Black food coloring gel
- Green food coloring gel
- Buttercream frosting or any thick frosting for decorating
- White candy melts or small white candy dots for eyes
How Much Time Will You Need?
This recipe takes about 15 minutes to prepare the brownie batter, 25 minutes to bake, and then let the brownies cool completely (about an hour). Decorating will take around 20-30 minutes, so plan for about 2 hours total before they’re ready to enjoy!
Step-by-Step Instructions:
1. Bake the Brownies:
Start by making your brownie batter following either a homemade recipe or a box mix. Once your batter is ready, pour it into a greased 8×8-inch baking pan. Bake as directed (typically around 20-25 minutes) until a toothpick comes out clean. After baking, let the brownies cool completely in the pan.
2. Prepare the Frosting:
While the brownies are cooling, divide your frosting into two bowls. Get one bowl ready to be colored black with food coloring. Stir until you achieve a nice, deep black. In the other bowl, mix in green food coloring to create a vibrant green shade for the eyes.
3. Decorate Your Brownies:
Once the brownies are completely cool, it’s decorating time! Use the black frosting to pipe or spread Frankenstein’s hair on the top edge of each brownie. Make it fun and jagged! Next, add black eyebrows above where the eyes will go—just a simple line works great.
4. Create the Eyes and Mouth:
With the green frosting, carefully outline two circles for the eyes on each brownie. Then, place your white candy melts or small candy dots inside these green circles to make the eyeballs. Lastly, use the black frosting to create a mouth with short vertical stitches. You can make it as spooky or silly as you like!
5. Set and Serve:
Let the decorated brownies sit for a few minutes to allow the frosting to firm up a bit. Then, slice them up and enjoy your wonderfully spooky Frankenstein brownies! Perfect for Halloween gatherings or any fun-themed parties!

Can I Use a Different Frosting for the Frankenstein Brownies?
Absolutely! If you don’t have buttercream on hand, you can use cream cheese frosting for a tangy flavor or a store-bought frosting. Just make sure it’s thick enough to hold its shape for decorating.
Can I Make These Brownies Gluten-Free?
Yes, you can substitute the regular brownie mix with a gluten-free brownie mix. Just follow the instructions on the package, and you’ll have a delicious gluten-free treat!
How Do I Store Leftover Brownies?
Store leftovers in an airtight container at room temperature for up to 3 days. If you want to keep them longer, you can freeze the brownies for up to a month. Just wrap them tightly in plastic wrap and foil before freezing.
Can I Make the Brownies Ahead of Time?
Definitely! You can bake the brownies a day or two in advance and decorate them later. Just keep them stored in an airtight container until you’re ready to frost and serve.