Name: Halloween Rice Krispies Treats (Frankenstein’s Monster!) Recipe
Prep time: 30 min
Cook time: 5 min
Total time: 50 min
Cuisine: American
Ingredients: 4 tablespoons unsalted butter; 10 ounces mini marshmallows (5-1/2 cups); Pinch kosher salt; Green food coloring (enough to achieve bright green color); 5 cups Rice Krispies cereal; 8 ounces semisweet chocolate chips; 1/4 cup chocolate sprinkles; 20 candy eyeballs; 20 Reese’s Minis unwrapped; Black writing gel; Red writing gel (optional); Nonstick baking spray (for pan)

Jump to Recipe· 4.8 from 9 reviews

If you’re looking for a fun, spooky, and downright delicious treat to serve this season, you’ve got to try my Halloween Rice Krispies Treats (Frankenstein’s Monster!) Recipe. These marshmallowy, crispy, and adorably creepy treats bring the nostalgia of classic Rice Krispies with a Halloween twist that’s easy to make and sure to impress your little monsters (and the big ones too!). Stick around because I’m sharing all my best tips to make these green Frankenstein monsters perfectly gooey, vibrant, and fun to decorate!

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Why This Recipe Works

Perfect Texture: The balance of buttery marshmallows and crispy cereal creates that iconic chewy but crunchy bite we all love.
Festive Look: The bright green marshmallow base and creative chocolate decorations bring Frankenstein’s monster to life in a cute way.
Simple Ingredients: You don’t need anything fancy, just pantry staples and a few fun additions like candy eyeballs to wow everyone.
Kid-Friendly Fun: Easy enough for little helpers to join in the fun of assembling and decorating the treats.

The image shows a green crispy rice treat shaped like a small rectangular figure with three layers. The large bottom layer is bright green and textured with puffed rice, forming the main body. On each side of this layer, two brown circular pieces stick out like arms. The top layer is a thick coating of smooth dark chocolate covered with long thin chocolate sprinkles, creating a hair-like effect. The treat has two round white candy eyes with black pupils placed near the top center of the green area. Below the eyes is a smiling mouth drawn with black icing and two black icing

Ingredients & Why They Work

This Halloween Rice Krispies Treats (Frankenstein’s Monster!) Recipe relies on simple ingredients that come together effortlessly, producing that perfect soft yet crispy texture. Choosing the right marshmallows and quality cereal will make all the difference in both flavor and consistency.

Unsalted butter: Melts smoothly to help bind the cereal and marshmallows; unsalted lets you control the saltiness perfectly.
Mini marshmallows: Smaller size means quicker melting and a smoother marshmallow coating.
Kosher salt: Just a pinch enhances the sweetness and balances the flavor.
Green food coloring: Gives that perfect Frankenstein green without altering taste.
Rice Krispies cereal: Classic choice for the perfect crunch and iconic texture.
Semisweet chocolate chips: For dipping and decorating, adds a rich contrast to the sweetness.
Chocolate sprinkles: Adds texture and a spooky touch to decorating.
Candy eyeballs: Essential for bringing Frankenstein’s monster to life—fun, freaky, and a bit silly!
Reese’s Minis Unwrapped: Used as the monster’s “neck bolts” for a peanut butter twist.
Black writing gel: To draw creepy stitches and mouths.
Red writing gel (optional): Adds a little “yikes” with some fake blood details.

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Note: You’ll find the complete list of ingredients, along with their exact measurements, in the printable recipe card at the bottom of this post.

Tweak to Your Taste

I love making this recipe my own by playing around with decorations and slightly adjusting sweetness. You can easily customize the look or flavor to fit your family’s preferences or party themes.

Variation: Sometimes I swap Reese’s Minis with small rectangular cookies or jelly beans for alternative “neck bolts” that add different textures or flavors.
Dietary tweaks: Use gluten-free Rice Krispies if needed, or swap marshmallows for vegan versions to accommodate dietary restrictions.
More colors: I’ve experimented with blue or purple food coloring for different monster looks, and my kids loved helping pick colors!
Darker chocolate: Using dark chocolate chips instead of semisweet adds a lovely depth that cuts the sweetness a bit.

Step-by-Step: How I Make Halloween Rice Krispies Treats (Frankenstein’s Monster!) Recipe

Step 1: Prep and Melt With Care

First, lightly spray your 13 x 9-inch pan with nonstick baking spray — this is key for easy removal later without the hassle of sticky stuck-on treats. Next, melt four tablespoons of unsalted butter in a large pot over medium-low heat. I always keep an eye on the butter, making sure it melts gently so it doesn’t brown or burn, which would alter the flavor.

Step 2: Add Marshmallows and Color

Add your 10 ounces (that’s about 5-1/2 cups) of mini marshmallows along with a pinch of kosher salt to the melted butter. Stir them slowly as they melt to a smooth, gooey mixture. Now here’s the fun part: stir in green food coloring a little at a time until you get that perfect bright Frankenstein green. I usually add a few drops, stir, then add more — it’s easier to add than to fix a color that’s too dark.

Step 3: Combine with Cereal

Remove the marshmallow mixture from the heat and pour in 5 cups of Rice Krispies cereal. Fold everything together using a spatula until every crunchy bit is coated in the vibrant green marshmallow goo. This step needs just a gentle touch — don’t overmix or you’ll squash the cereal and lose that great texture.

Step 4: Press Into the Pan and Cool

Transfer your monster mixture into the prepared pan. I like to use a piece of parchment paper or lightly greased hands to press it evenly into the corners and smooth the surface. Let it sit at room temperature for about 15 minutes to firm up — this helps with easier cutting and decorating later.

Step 5: Cut Into Frankenstein’s Monster Shapes

Once set, flip the slab onto a cutting board. Cut the rectangle in half lengthwise, then cut each half into five equal pieces crosswise, giving you 10 Frankenstein monsters to decorate — perfect for a party or classroom treat!

Step 6: Melt Chocolate and Dip

Place your 8 ounces of semisweet chocolate chips into a microwave-safe bowl or glass measuring cup — I find glass containers best for dipping because you can dip the Rice Krispies treats easily. Microwave in 30-second intervals, stirring between each, until smooth and melt-ready. Dip one end of each treat in the melted chocolate and immediately sprinkle with chocolate sprinkles for that spooky texture.

Step 7: Add Eyes and Neck Bolts

While the chocolate is still wet, use the remaining melted chocolate as glue to attach candy eyeballs and Reese’s Minis as Frankenstein’s signature “neck bolts.” This is the part my kids love most because they get to get creative and make each monster unique.

Step 8: Detail with Writing Gel

Finally, use black writing gel to draw on creepy mouths and stitches. If you want to get extra spooky, add some red writing gel to suggest a bit of ghoulish “blood.” Let your monster treats sit until the chocolate hardens, and you’re ready to enjoy!

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Pro Tips for Making Halloween Rice Krispies Treats (Frankenstein’s Monster!) Recipe

Gentle Heat: Keep the heat low when melting butter and marshmallows to avoid scorching and tough treats.
Use Parchment Paper for Pressing: Pressing the mixture with parchment works wonders for even thickness and prevents sticking.
Work Quickly: Once the marshmallows melt, combine with cereal and press immediately before the mixture cools and hardens.
Dip and Decorate Fast: Dip one treat at a time and decorate immediately so sprinkles and candy stick before chocolate sets.

How to Serve Halloween Rice Krispies Treats (Frankenstein’s Monster!) Recipe

The image shows seven Frankenstein monster shaped treats on a white plate placed on a white marbled surface. Each treat has two layers: the bottom layer is bright green with a bumpy texture made of puffed rice, forming the main face and body; the top layer represents the hair, covered in dark brown chocolate sprinkles with a rough texture. Each face has two round candy eyes with black pupils, a black icing mouth in different expressions, and some have black icing stitches on the green layer. There are small red icing details near the hairline resembling blood drops. On each side of the treats, there are small brown cupcake liners attached sideways to look like bolts. Two extra candy eyes are placed on the plate as decoration. Photo taken with an iphone --ar 4:5 --v 7

Garnishes

For garnish, I love using extra candy eyeballs and sprinkles to scatter on the serving platter for more spooky fun. Sometimes I add little green or black sugar crystals for extra shimmer — it makes the treats look like they popped straight out of a mad scientist’s lab!

Side Dishes

Pair these treats with classic Halloween drinks like spiced apple cider or a bubbly punch with gummy worms floating on top. If it’s a party, add bowls of mini pretzels or popcorn for salty snacks that balance the sweet.

Creative Ways to Present

For Halloween gatherings, I like serving these treats on a black platter lined with orange tissue paper or faux cobweb decorations. You can also skewer the treats with popsicle sticks for “Frankenstein pops” that are easy for kids to hold. Wrapping individually with clear treat bags tied with a green ribbon makes for adorable party favors!

Make Ahead and Storage

Storing Leftovers

These treats keep beautifully in an airtight container at room temperature for up to 3 days. I recommend separating layers with parchment paper to avoid sticking. The texture stays just right — chewy with a crisp snap.

Freezing

I’ve frozen Halloween Rice Krispies Treats (Frankenstein’s Monster!) Recipe before by wrapping each treat tightly in plastic wrap and storing them in a freezer-safe bag. When thawed, they’re almost as fresh as the day I made them, perfect for prepping ahead of spooky celebrations.

Reheating

No reheating needed for these little monsters, but if you want to soften slightly, pop them in the microwave for 5-10 seconds wrapped in a paper towel — just don’t overdo it or they’ll get sticky and lose their crunch.

FAQs

Can I use regular-sized marshmallows instead of mini marshmallows?

Yes! Regular-sized marshmallows will work, but they’ll take a bit longer to melt. Just be patient and stir frequently on low heat to avoid scorching the mixture. Your treats might be slightly less smooth but still delicious.
What if I don’t have candy eyeballs for decorating?

No worries! You can create eyes using small white chocolate chips with a dot of black writing gel, or use mini marshmallows with chocolate chip or icing pupils. Feel free to get creative with whatever candies you have on hand.
How do I keep the treats from sticking to my hands when pressing?

I always lightly grease my hands with butter or use a piece of parchment paper to press the mixture into the pan. This prevents sticky fingers and helps get a smooth surface!
Can I make this recipe vegan?

Absolutely! Use vegan marshmallows and a dairy-free butter alternative. Just double-check that your Rice Krispies cereal is vegan-friendly (some versions contain vitamin D3 from animal sources).
What’s the best way to store these treats for a Halloween party?

Store your Frankenstein Rice Krispies treats in an airtight container layered with parchment paper at room temp. If you’re prepping in advance, individually wrap each treat to keep them fresh and prevent decorations from smudging.

Final Thoughts

Honestly, the Halloween Rice Krispies Treats (Frankenstein’s Monster!) Recipe holds a special spot in my kitchen during the spooky season. It’s one of those simple, joyful recipes that brings everyone—from the youngest ghost to the oldest ghoul—together for a hands-on, sweet triumph. These treats are easy to whip up, endlessly customizable, and delightfully nostalgic. I hope you’ll make them this Halloween and make some fun memories while you’re at it. Trust me, your Frankenstein crew will thank you!