Monster Marshmallow Cereal Bars

Featured in: Sweet Cravings

Whip up a vibrant dessert featuring crispy multigrain cereal and gooey marshmallows, all brought together with melted butter and a hint of vanilla. Mix in candy-coated chocolates and mini chips for bursts of color and flavor, then top with candy eyes for a playful touch. With a quick no-bake method, these bars are pressed into a pan and cooled before slicing. Swap cereals for personal taste, drizzle chocolate for extra flair, and enjoy a fun treat that stores easily for a few days. Perfect for gatherings, lunchboxes, or any time a sweet snack is needed.

Updated on Mon, 13 Oct 2025 19:35:41 GMT
Close-up of colorful Monster Marshmallow Cereal Bars, oozing with melted marshmallows and candy. Save
Close-up of colorful Monster Marshmallow Cereal Bars, oozing with melted marshmallows and candy. | crumbnest.com

Monster Marshmallow Cereal Bars are my secret weapon for when the kids want something playful and sweet but I do not want to turn on the oven. These bars have a satisfyingly chewy texture thanks to gooey marshmallows, with pops of vibrant color from chocolate candies and silly candy eyes for monster fun. Perfect when you need a dessert in minutes or want a treat that stands out at parties.

I first whipped these up for a Halloween party and the whole tray vanished before I could even sit down. Now we make them for sleepovers or as lunchbox surprises. They always bring smiles and a little chaos to the kitchen.

Ingredients

  • Multigrain or crispy rice cereal: gives that irresistible classic crunch and holds the bars together. Look for fresh cereal that is still crispy when squeezed slightly in the bag.
  • Mini marshmallows: provide structure and gooeyness without overpowering sweetness. Fresh marshmallows melt better and create a smoother mix.
  • Unsalted butter: delivers richness and helps the marshmallows melt evenly. I like to use European style butter for extra flavor.
  • Vanilla extract: rounds out flavors so the sweetness feels balanced. Pure vanilla works best for this.
  • Colorful candy coated chocolates: bring vibrant color and chocolate bursts. Choose chocolates with bright shells and look for peanut free labeling if needed.
  • Mini chocolate chips: add extra meltiness and decadence. Use high quality chips for best results.
  • Candy eyes: make the bars playful and perfect for parties. Check labels to ensure freshness and clear shapes.

Instructions

Prepare The Pan:
Lightly grease a nine by thirteen inch baking pan or line it with parchment paper. Make sure corners are coated so the bars will not stick later.
Melt The Butter And Marshmallows:
In a large heavy bottomed saucepan over medium low heat melt the butter until foamy. Add the mini marshmallows and stir constantly using a silicone spatula until fully melted and smooth. This may take about three to five minutes. Take the pot off the heat and immediately mix in pure vanilla extract.
Combine With Cereal:
Pour all the cereal into the melted marshmallow mixture and quickly fold it in. Stir gently but swiftly to coat every piece and avoid crushing the cereal.
Mix In Half The Candy And Chocolate Chips:
Add half the candy coated chocolates and half the mini chocolate chips to the mixture. Fold them in gently so the candies are evenly distributed without melting fully.
Press And Shape The Bars:
Transfer the sticky mixture to the prepared pan. Use a buttered spatula or wax paper to press the mixture down firmly and evenly. Work from corners to sides for an even slab.
Decorate The Top:
Sprinkle the reserved candy coated chocolates mini chocolate chips and candy eyes over the surface while still warm. Press down lightly so they adhere but do not crush the shapes.
Cool And Cut:
Let the bars cool completely uncovered for about thirty minutes. Once set slide a sharp knife along the edges and cut into twelve equal bars.
Homemade Monster Marshmallow Cereal Bars ready to serve, a fun, sweet, and crispy treat. Save
Homemade Monster Marshmallow Cereal Bars ready to serve, a fun, sweet, and crispy treat. | crumbnest.com

There is something magical about watching marshmallows melt down and seeing the kids giggle as they stick on the candy eyes. My favorite part is letting everyone decorate their own bar before cutting. It turns snack time into a little creative project.

Storage Tips

Once cooled cut bars keep best in a tight lidded container at room temperature for three days. If you want to stack bars layer with parchment to prevent sticking.

Ingredient Substitutions

You do not have to stick with rice cereal. Fruity cereals chocolate flavored cereals or even cornflakes all work beautifully in this recipe. White chocolate chips are good for a softer taste.

Serving Suggestions

Cut bars smaller for party favors or wrap in parchment for lunchboxes. For holidays swap colors of candies to fit the theme.

Cultural and Historical Context

Cereal bars have a strong nostalgic pop culture presence in American kitchens especially since the invention of Rice Krispies Treats in the late nineteen thirties. This monster style gives a playful twist to that classic and keeps the tradition fresh for new generations.

Seasonal Adaptations

Swap candy colors for red and green for winter parties, purple and orange for Halloween, pastels for springtime brunches.

Success Stories

The first time I made these the bars disappeared in less than an hour at a family reunion. My niece insisted on adding extra candy eyes and now it is our little tradition to make the bars as wacky as possible. They bring out everyone’s silly side.

Freezer Meal Conversion

You can freeze the uncut slab tightly wrapped in plastic. Thaw at room temperature then slice into bars for a quick sweet treat whenever you need.

Top-down view of pan of Monster Marshmallow Cereal Bars studded with candies and chocolate chips. Save
Top-down view of pan of Monster Marshmallow Cereal Bars studded with candies and chocolate chips. | crumbnest.com

Monster Marshmallow Cereal Bars turn any ordinary day into a silly treat. With playful colors and chewy texture, these party bars are sure to bring smiles.

Recipe FAQ

Can I use different cereals for these bars?

Yes, you can substitute with cornflakes, puffed rice, or your favorite crispy cereal for unique flavor and texture.

How do I keep the bars from sticking to the pan?

Lightly grease the pan or line it with parchment paper before pressing the mixture in to ensure easy removal.

Are candy eyes necessary for the monster effect?

Candy eyes add a fun monster look, but you can skip them or substitute with mini marshmallows or chocolate chips.

How long do the bars stay fresh?

Store the bars in an airtight container at room temperature for up to 3 days for best freshness and texture.

Can I add extra chocolate drizzle on top?

Yes, drizzle melted white or dark chocolate over the bars before adding candy eyes for extra flavor and decoration.

Monster Marshmallow Cereal Bars

Colorful bars blend cereal, marshmallow, and chocolates for an easy, fun dessert ideal for parties or snacks.

Prep duration
10 min
Cook duration
5 min
Complete duration
15 min
Created by Chloe Martin


Skill Level Easy

Heritage American

Output 12 Portions

Dietary considerations Meat-Free

Components

Cereal Base

01 6 cups multigrain or crispy rice cereal

Marshmallow Mixture

01 4 cups mini marshmallows
02 3 tablespoons unsalted butter
03 1 teaspoon vanilla extract

Mix-ins & Toppings

01 1 cup colorful candy-coated chocolates (such as M&M’s)
02 1/2 cup mini chocolate chips
03 1/4 cup candy eyes

Directions

Phase 01

Prepare Baking Pan: Lightly grease a 9x13-inch baking pan or line the pan with parchment paper for easy removal.

Phase 02

Melt Butter and Marshmallows: In a large saucepan over medium-low heat, melt unsalted butter. Add mini marshmallows and stir continuously until melted and smooth. Remove from heat and incorporate vanilla extract.

Phase 03

Combine Cereal: Quickly fold in the multigrain or crispy rice cereal. Stir until the cereal is evenly coated by the marshmallow mixture.

Phase 04

Mix in Chocolates: Gently mix in half of the candy-coated chocolates and half of the mini chocolate chips for even distribution.

Phase 05

Press Into Pan: Transfer the prepared mixture to the greased or lined pan. Press the mixture firmly into an even layer using a buttered spatula or wax paper.

Phase 06

Add Toppings: Sprinkle the remaining candy-coated chocolates, mini chocolate chips, and candy eyes evenly over the surface. Press toppings in gently to set.

Phase 07

Cool and Cut: Let the bars cool completely at room temperature for approximately 30 minutes. Once set, slice into 12 equal bars.

Tools needed

  • Large saucepan
  • Mixing spoon or spatula
  • 9x13-inch baking pan
  • Parchment paper

Allergy details

Review each component for potential allergens and seek medical guidance if you're uncertain about ingredients.
  • Contains dairy from butter and milk-containing chocolate candies.
  • Contains soy and may include traces of peanuts or tree nuts present in some candies.
  • Contains gluten if wheat-based cereal is used.
  • Review candy packaging for specific allergen information.

Nutritional information (each portion)

These values are approximate guides only and shouldn't replace professional medical consultation.
  • Energy: 220
  • Fats: 6 g
  • Carbohydrates: 40 g
  • Proteins: 2 g