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

BySarah
Jump to Recipe· 4.6 from 58 reviews

If you’re looking to add a little spooky fun to your Halloween party snacks, you’ve got to try my Halloween Rice Krispies Treats (Frankenstein’s Monster!) Recipe. These treats are not only adorable but also irresistibly gooey and crunchy—a perfect combo that kids and adults alike can’t get enough of. I’m excited to share all my tips and tricks, so by the end of this, you’ll be making your very own green monster treats that steal the show every time!

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Why This Recipe Works

  • Perfect Color & Texture: The bright green marshmallow mix creates that iconic Frankenstein look with a sticky yet crispy texture.
  • Easy Decoration: Using candy eyeballs and mini Reese’s cups makes decorating fun and foolproof for all ages.
  • No-Bake & Quick: Ready in under an hour, great for last-minute Halloween party prep.
  • Kid-Friendly: Hands-on assembly is a blast for little helpers, making it a creative activity as much as a treat.
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 this …

Ingredients & Why They Work

Every ingredient in my Halloween Rice Krispies Treats (Frankenstein’s Monster!) Recipe plays a crucial role in flavor, texture, or that spooky look. Choosing the right brands and making small tweaks can elevate your results, so here’s what I recommend.

  • Nonstick baking spray: Prevents sticking, making it easier to remove the treats from the pan without breaking.
  • Unsalted butter: Controls saltiness and adds rich flavor, melting smoothly to bind the marshmallows.
  • Mini marshmallows: Provide that gooey base—mini size melts evenly and helps create a uniform texture.
  • Kosher salt: Balances sweetness and enhances the green marshmallow flavor.
  • Green food coloring: Key to getting that vibrant Frankenstein green—gel-based coloring works best for vivid hues without changing texture.
  • Rice Krispies cereal: The crispy element—make sure to use classic Rice Krispies for that perfect crunch.
  • Semisweet chocolate chips: For dipping and decorating—melts nicely and adds a touch of bittersweet contrast.
  • Chocolate sprinkles: Adds texture and a spooky “hair” effect when sprinkled onto the dipped treats.
  • Candy eyeballs: Instant character! These make Frankenstein’s face come alive with minimal effort.
  • Reese’s Minis Unwrapped: Used as neck bolts, their peanut butter flavor complements the sweetness and adds a fun detail.
  • Black writing gel: Perfect for drawing mouths and stitches—choose a gel that won’t slide off the treats.
  • Red writing gel (optional): For that eerie blood effect—adds a fun gore touch if you’re feeling extra spooky.
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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 personally like to switch up the candy decorations depending on who’s eating. Feel free to get creative! Halloween treats are all about having fun, so don’t hesitate to add your personal twist or adapt for dietary needs.

  • Variation: One year, I swapped the Reese’s Minis for small gummy candy screws to play up the “monster” vibe—kids loved it!
  • Dairy-Free Option: Use vegan butter and dairy-free marshmallows to accommodate dietary restrictions without losing taste.
  • Extra Crunch: Toast the Rice Krispies cereal lightly before mixing in for a nuttier flavor and crunchier texture.

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

Step 1: Prep Your Pan and Melt Butter

Spray your 13 x 9-inch pan with nonstick baking spray—this step is a game changer to lift your treats out cleanly. Then, melt 4 tablespoons of unsalted butter in a large pot over medium-low heat. Go slow here to avoid burning. I always stir gently to keep the butter from sizzling too aggressively.

Step 2: Add Marshmallows, Salt, and Color

Once your butter is melted, toss in 10 ounces of mini marshmallows and a pinch of kosher salt. Add green food coloring bit by bit—trust me, getting that bright Frankenstein green is key, so don’t be shy with the color. Stir continuously until the mixture is smooth and fully combined. The marshmallows will melt into a shiny, sticky syrup.

Step 3: Mix in Rice Krispies

Remove the pot from heat and dump in 5 cups of Rice Krispies cereal. Stir quickly but gently until every piece is coated in the green marshmallow mixture. You want the cereal to be fully covered—they hold everything together and give that crispy texture we love.

Step 4: Press the Mixture into the Pan

Transfer the green cereal mixture to your prepped pan. I like to lay a piece of parchment paper on top and press down firmly with my hands to avoid sticking and to get an even thickness. Let it set at room temperature for about 15 minutes until firm.

Step 5: Cut and Dip Your Treats

When cool, turn the slab out onto a cutting board. Cut the rectangle in half lengthwise, then cut each half into 5 pieces across. Now, melt 8 ounces of semi-sweet chocolate chips in a microwave-safe glass bowl in 30-second intervals, stirring after each until smooth. Dip one end of each treat in melted chocolate and lay on parchment paper. Immediately sprinkle with chocolate sprinkles for that creepy “hair” effect.

Step 6: Add the Frankenstein Details

Use the remaining melted chocolate like glue to attach 20 candy eyeballs and 20 mini Reese’s Minis as neck bolts. Then, use black writing gel to draw mouths and stitches. If you’re feeling extra spooky, add some red writing gel for a bit of “blood”. This part is where the monster really comes alive!

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

  • Use Gel Food Coloring: Gel colors pack more pigment without thinning the marshmallows, giving you a brighter green Frankenstein tone.
  • Grease Hands or Parchment: When pressing the mixture, this prevents stickiness and helps you get tight, even bars.
  • Microwave Chocolate Slowly: Heating chocolate in short increments avoids burning and keeps it silky smooth for dipping.
  • Decorate Quickly: Chocolate sets fast—have your sprinkles and candies ready to go so they stick perfectly.

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

I love adding those candy eyeballs and Reese’s neck bolts because they add personality without fuss. You could also sprinkle a little edible glitter or crushed peppermint for extra flair, but these classic touches keep the monster vibe strong and kid-friendly.

Side Dishes

Pair these treats with warm apple cider or a spooky punch to keep the Halloween theme flowing. A simple cheese platter or caramel popcorn also complements them wonderfully if you’re hosting a larger spread.

Creative Ways to Present

For a party, I like arranging the Frankenstein treats on a black slate board with fake cobwebs and battery-operated candles around for ambiance. You could even stand the treats upright stuck into a foam base dotted with green moss or sprigs for a Frankenstein “garden.” Kids love the presentation almost as much as the snacks!

Make Ahead and Storage

Storing Leftovers

Once fully decorated, store your Halloween Rice Krispies Treats (Frankenstein’s Monster!) Recipe in an airtight container at room temperature. I usually layer parchment paper between layers to keep them from sticking, and they’ll stay fresh for up to 3 days—if they last that long!

Freezing

Yes, you can freeze these! Wrap each treat tightly in plastic wrap and then place them in a freezer-safe bag. They keep well for up to a month. When you’re ready, thaw at room temperature to keep the marshmallows soft and chewy.

Reheating

I don’t recommend microwaving leftover Rice Krispies treats as they can get gooey and lose their crispiness. Instead, let them warm at room temperature for 30 minutes or so before serving. This helps them regain a nice chewy texture without being sticky or hard.

FAQs

  1. Can I use regular marshmallows instead of mini?

    You can use regular marshmallows, but mini marshmallows melt more evenly and quickly, which helps achieve that smooth, sticky texture perfect for binding the Rice Krispies. If you only have large marshmallows, chop them into smaller pieces before melting.

  2. How do I get the green color so vibrant?

    I recommend gel-based food coloring because it’s concentrated and won’t thin out the melted marshmallow mixture. Add it gradually, stirring well, until you hit the bright Frankenstein green you want.

  3. What’s the best way to prevent the treats from sticking?

    Spraying your pan liberally with nonstick baking spray and then pressing the mixture with greased hands or parchment paper prevents sticking. Also, storing them properly in an airtight container with parchment between layers helps keep them from sticking to each other.

  4. Can I make these without chocolate?

    Absolutely! The chocolate adds a fun decorative touch, but you can skip it and decorate with edible markers or icing instead. Just be sure to press the Rice Krispies mixture firmly and evenly for clean cuts.

Final Thoughts

This Halloween Rice Krispies Treats (Frankenstein’s Monster!) Recipe is one of my favorite spooky season projects because it’s fun, fast, and gives you that perfect mix of cute and creepy. Whether you’re making it with your kids or for a party, the smiles you’ll get from presenting these little monsters will totally make your day. Give it a go—I promise it’ll become a Halloween classic in your house just like it is in mine!

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

5 Stars 4 Stars 3 Stars 2 Stars 1 Star 4.6 from 58 reviews
  • Author: Sarah
  • Prep Time: 30 minutes
  • Cook Time: 5 minutes
  • Total Time: 50 minutes
  • Yield: 10 servings
  • Category: Snack
  • Method: Stovetop
  • Cuisine: American
Print Recipe

Description

Create spooky and delicious Halloween Rice Krispies Treats inspired by Frankenstein’s Monster. These fun, green-colored treats feature crispy marshmallow goodness, chocolate-dipped ends, candy eyeballs, and cute details drawn with writing gel—perfect for a festive party or a delightful Halloween snack.

Ingredients

Main Ingredients

  • Nonstick baking spray
  • 4 tablespoons unsalted butter
  • 10 ounces mini marshmallows (5-1/2 cups)
  • Pinch kosher salt
  • Green food coloring
  • 5 cups Rice Krispies cereal

Decorations

  • 8 ounces semisweet chocolate chips
  • ¼ cup chocolate sprinkles
  • 20 candy eyeballs
  • 20 Reese’s Minis Unwrapped
  • Black writing gel
  • Red writing gel (optional)

Instructions

  1. Prepare Pan: Spray the bottom and sides of a 13 x 9-inch pan with nonstick baking spray to prevent sticking.
  2. Melt Butter: In a large pot, melt 4 tablespoons of unsalted butter over medium-low heat until fully melted.
  3. Add Marshmallows and Color: Add 10 ounces of mini marshmallows, a pinch of kosher salt, and green food coloring. Stir continuously until the mixture is fully combined, smooth, and bright green; add more food coloring if needed.
  4. Mix Cereal: Remove the pot from heat. Add 5 cups of Rice Krispies cereal and stir until the cereal is evenly coated with the green marshmallow mixture.
  5. Press Mixture into Pan: Transfer the mixture into the prepared pan. Use a piece of parchment paper or greased hands to press the mixture evenly toward the bottom of the pan. Let it stand at room temperature for 15 minutes to set.
  6. Cut Treats: Turn the set mixture out onto a cutting board. Cut the rectangle lengthwise in half, then cut each half into 5 pieces crosswise, making 10 treats total.
  7. Melt Chocolate: Place 8 ounces of semisweet chocolate chips into a microwave-safe glass measuring cup or bowl. Microwave in 30-second intervals, stirring between intervals, until the chocolate is smooth and fully melted.
  8. Dip and Decorate: Dip one end of each Rice Krispies treat into the melted chocolate. Place the dipped treats on parchment paper and immediately sprinkle with ¼ cup chocolate sprinkles.
  9. Add Candy Decorations: Use the remaining melted chocolate to attach 20 candy eyeballs and 20 unwrapped Reese’s Minis as Frankenstein’s neck bolts on the treats.
  10. Draw Details: Use black writing gel to add mouths and stitches. Optionally, use red writing gel to add a bit of “blood” for an extra spooky effect.

Notes

  • Use parchment paper or lightly grease your hands when pressing the mixture to prevent sticking.
  • Adjust green food coloring gradually to achieve a bright, vibrant color without overpowering flavor.
  • If you don’t have candy eyeballs, you can substitute with small round candies or draw eyes with writing gel.
  • To melt chocolate smoothly, avoid overheating by stirring frequently and microwaving in short bursts.
  • These treats can be stored in an airtight container at room temperature for up to 3 days.
  • For a dairy-free version, substitute butter with a vegan margarine and use dairy-free chocolate chips.

Nutrition

  • Serving Size: 1 treat
  • Calories: 250 kcal
  • Sugar: 18 g
  • Sodium: 100 mg
  • Fat: 12 g
  • Saturated Fat: 7 g
  • Unsaturated Fat: 4 g
  • Trans Fat: 0 g
  • Carbohydrates: 35 g
  • Fiber: 1 g
  • Protein: 2 g
  • Cholesterol: 20 mg

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