These easy Halloween Rice Krispie treats turn one batch into four spooky designs: mummies, Frankensteins, spiders, and monster eyes. It is the same butter-and-marshmallow base I make year-round, dressed up with candy melts and candy eyes.

I made these for my daughter’s birthday party (October 26, a few days before Halloween). They work just as well for a class party or a trick-or-treat tray.

The base is my soft and chewy Rice Krispies treats, so if you have made those before, you already know it by heart.

Halloween rice krispie treats, four designs on one tray.

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Halloween Rice Krispie Treats | 4 Easy Spooky Designs

If you love a no-bake cereal treat, you’ll also want to try my Chocolate Chip Rice Krispies treats, Peeps Rice Krispies treats, and Fruity Pebbles marshmallow treats.

For more fall ideas, see my roundup of easy fall desserts.

Why you’ll love this recipe

One batch, four looks: a variety tray from a single recipe.
Kid-friendly decorating: simple enough for little helpers.
Spooky-cute: festive without being too scary.
Make-ahead friendly: stays fresh for up to 2 days.
Party-ready: bake sales, classroom trays, and Halloween dessert boards.

Make them homemade or store-bought

Homemade: Use my Rice Krispie Treats recipe. Press into a 9×13 pan, let set, then cut into 16 squares.

Store-bought: Unwrap 16 Rice Krispies Treats and decorate right away.

Ingredients you’ll need

Here’s what you’ll need to decorate all 16 squares (4 of each design):

Rice Krispie treat base: homemade or store-bought squares.
White candy melts: I like Ghirardelli Melting Wafers. They cover the mummies and spider webs, and you can tint them for the monster eyes.
Black candy melts or black icing: for Frankenstein’s hair, the stitched smiles, and the spider webs and legs.
Candy eyeballs: a mix of regular and mini sizes.
Mini Oreo cookies: split them and use one wafer half for each spider body.

See the recipe card below for full measurements.

Substitutions and variations

White or semisweet chocolate instead of candy melts. It works, but chocolate doesn’t set quite as firmly. Candy melts are my pick here: they melt smoothly, set firm, and come in every Halloween color you’d want.
Store-brand crispy rice cereal. I always make these with Rice Krispies, so I haven’t tested a store brand, though I can’t think of a reason the base wouldn’t work the same way.

This recipe has not been tested with other substitutions or variations. If you replace or add any ingredients, please let me know how it turned out in the comments below!

Step-by-step instructions

The ingredient amounts listed are for decorating 4 squares of each design. To make all 16 squares in one style, multiply that design’s toppings by 4.

Before you start: Line a sheet pan with parchment and set out your squares. Work on one design at a time (each uses 1–2 colors). Melt wafers in a microwave-safe bowl in 20–30 second bursts, stirring between each, until smooth.

How to decorate rice krispie treats for Halloween

All four designs start from the same pan of treats, cut into 16 squares. Melt the candy melts, set out the candy eyes, and let everyone pick a design. The spiders take the longest, and the monster eyes take about a minute, so there is a design for every attention span at your table.

If you are building a whole party tray, add my Halloween brownies and Halloween pretzel rods.

Spider Rice Krispie Treats

A hand holds a rice krispie treat on parchment paper while a spoon spreads white icing or frosting over the top. The background features a black mesh pattern.

Step 1: Coat the tops of 4 squares with melted white candy melts.

A hand pipes chocolate lines onto a rectangular rice krispie treat topped with white icing, placed on parchment paper over a black lace-patterned surface.

Step 2: Transfer the black melts to a piping bag fitted with a Wilton #3 tip (or a zip-top bag with a tiny corner snipped off). Pipe 3–4 straight lines down the treat.

A hand decorates a frosted rectangular dessert with a chocolate spiderweb pattern using a piping bag, on a piece of parchment paper over a lace-patterned surface.

Step 3: Connect the sections with slightly curved lines to form a web.

A hand decorates a rice crispy treat topped with white icing and a chocolate cookie by piping chocolate in a spiderweb pattern. The treat sits on parchment paper over a black mesh background.

Step 4: Press a mini Oreo wafer half onto each web; pipe 2 tiny black icing dots.

A rectangular dessert topped with white icing, a chocolate spider made from a cookie and candy eye, and a chocolate web design, placed on parchment paper over a black mesh tablecloth.

Step 5: Attach mini eyeballs.

A hand decorates spider rice krispie treats with piped chocolate web.

Step 6: Pipe 2–3 black legs on each side of the Oreo, dragging slightly onto the square.

Monster eye Rice Krispies treats

A hand spreads purple frosting onto a rice krispies treat with a spoon. A bowl of mini marshmallows is visible in the background on a black and white mesh surface.

Step 1: Coat the tops of 4 squares with melted orange and purple melts.

Monster eye halloween rice krispies with purple candy melts

Step 2: Press on multiple candy eyeballs in random spots. Add sprinkles if desired.

Frankenstein Rice Krispies Treats

A hand spreads green icing onto a rectangular Rice Krispies treat using a spoon, with marshmallows visible in a bowl nearby on a textured black and white surface.

Step 1: Coat the tops of 4 squares with melted green candy melts.

A hand decorates a rectangular rice crispy treat with green icing and black icing for hair on top, creating a Frankenstein monster look. The treat sits on parchment paper over a black mesh surface. Candy corn is visible in the corner.

Step 2: Transfer some black melts to a piping bag. Pipe “hair” with melted black candy melts.

A hand decorates a green-frosted Rice Krispies treat shaped like Frankenstein’s face, next to a bowl of mini marshmallows.

Step 3: Add black jimmies for added texture, if desired.

Frankenstein rice krispie treats with green candy melts, chocolate sprinkle hair, and candy eyes.

Step 4: Press on candy eyeballs and draw a stitched smile with black icing or black melts.

Mummy Rice Krispie treats

A hand holds a rice crispy treat on parchment paper while a spoon spreads white frosting on top; a bowl of mini marshmallows is visible above.

Step 1: Coat the tops of 4 squares with melted white candy melts; let set slightly.

A hand places a candy eye on a frosted rice cereal treat shaped like a rectangle, with mini marshmallows in a bowl nearby and more decorated treats in the background.

Step 2:Press 2 candy eyeballs onto each square.

A rectangular treat covered in white icing with two candy eyes is being decorated to look like a mummy. It sits on parchment paper on a black spiderweb tablecloth, with a bowl of marshmallows nearby.

Step 3: Transfer some white melts to a piping bag. Pipe the first set of “bandages” across the treat, leaving gaps for the eyes.

A hand decorates mummy rice krispie treats with candy melt stripes and candy eyes.

Step 4: Add more overlapping lines at different angles for a wrapped mummy look.

Sarah’s tips

Work in batches. Candy melts set quickly, so decorate 3–4 squares at a time before moving on to the next design.
Keep melts smooth. If they thicken or seize while you work (gel food coloring can do this), reheat in 10-second bursts or stir in about 1 teaspoon of coconut oil per cup of wafers.
Use parchment or a silicone mat. Decorated squares lift off cleanly once set.
Let them set before stacking. Wait until the candy melts are firm to the touch before stacking or packing them.
No piping bags? Spoon melts into a zip-top bag, snip a tiny corner, and pipe away.
Don’t stress about perfection. Uneven mummy bandages, silly monster eyes, and wiggly spider legs only make these cuter.
For party trays, insert popsicle sticks before decorating to make spooky pops.

Recipe FAQs

Yes. Decorate them a day ahead, keep them covered until serving, and store the finished squares airtight at room temperature for up to 2 days, with parchment between the layers.

Use white candy melts and tint them with gel food coloring. Gel works better than liquid. If the melts thicken, see Sarah’s tips above.

A close-up of easy halloween rice crispy treats for a class party.

Storage

Room temperature: store decorated squares in an airtight container at room temperature for up to 2 days, with parchment between layers to prevent sticking. They’re safe past that; they just start drying out.
Avoid the fridge: refrigeration makes them hard and dry, so skip it.
Freezing: layer them with wax paper in an airtight container for up to 6 weeks, then let them thaw for 15 minutes at room temperature before serving.