Sauces & Condiments
This Rice Krispie icing recipe transforms three simple pantry staples into a velvety, marshmallow-infused frosting that’s ready in just 5 minutes. The secret lies in melting marshmallows and butter together until perfectly smooth, then blending in condensed milk for that signature crispy texture.
I developed this version after years of testing—it’s the foolproof method I use for everything from Rice Krispie treats to cake decorating. What sets this icing apart is its light, airy consistency that stays spreadable without being too sweet.
The marshmallows melt into a glossy finish while the butter adds richness, creating a neutral base you can flavor however you like. White chocolate swirls, peanut butter drizzles, or even vegan alternatives work beautifully here—no one will guess it’s this simple.
For cake frosting, pipe it directly onto layers or use it as a filling between cookies. The icing also doubles as a glaze for Rice Krispie treats, giving them that classic crunchy coating. Best of all?
It comes together in one pot with minimal cleanup, making it perfect for last-minute baking or holiday decorating. Master this recipe once, and you’ll have a go-to icing for any occasion—whether you’re dressing cupcakes, filling sandwich cookies, or topping homemade Rice Krispie squares.
The possibilities are endless, and the results are always impressive.
Ingredients for rice krispie icing
Three pantry staples and two optional mix-ins create this legendary icing everyone will beg for.
| Ingredient | Amount | Notes |
|---|---|---|
| Large Marshmallows 🍪 | 10 oz | Mini marshmallows work too |
| Unsalted Butter 🧈 | ½ cup | Cold for easier melting |
| Sweetened Condensed Milk 🥛 | 1 cup | Canned, not powdered |
| Vanilla Extract 🌿 | 1 tsp | Pure extract preferred |
| Fine Sea Salt 🧂 | ¼ tsp | Balances sweetness |
| White Chocolate Chips 🍫 | 2 oz | Optional for swirls |
| Peanut Butter 🥜 | 2 tbsp | Creamy variety |
| Food Coloring 🎨 | ½ tsp | Optional, gel preferred |
The marshmallows make or break this icing. Kraft Jet-Puffed or store-brand mini marshmallows melt perfectly—just avoid the giant fluffy kind, which can turn grainy. Butter matters too: European-style unsalted adds richness, but regular butter works in a pinch. Condensed milk? Store it in a cool, dark place—heat makes it curdle. For the vanilla, pure extract (not imitation) gives the best flavor. I always double-check the expiration date on marshmallows—they dry out fast once opened, and stale marshmallows ruin the texture.
No white chocolate? Dark chocolate chips at half the amount work, or skip it entirely. Peanut butter swaps? Almond butter or sunflower seed butter both work, but the flavor changes. Running low on vanilla? Almond extract at half the amount adds depth. For food coloring, gel-based (like Wilton) blends better than liquid. Pro tip: if your icing gets too thick, microwave 10 seconds at a time with a splash of warm water to loosen it up. The salt is crucial—it balances the sweetness and keeps the icing from tasting cloying.
This icing stays fresh for 5 days in the fridge, sealed in an airtight container. For longer storage, freeze portions in ice cube trays—thaw at room temp before using. If you're making it ahead for a party, prep the base icing first, then add mix-ins just before serving. The white chocolate swirls look best when added right before piping, so they stay glossy. Leftovers? Use them to glaze Rice Krispie treats or drizzle over pancakes—trust me, it's delicious that way too.
Why You'll Love This Recipe
- Three-Ingredient Magic: I swear by this combo—melted butter, condensed milk, and marshmallows. That’s it. No measuring cups, no fancy tools, just a pot and a spoon. Honestly, if I had to pick one dessert that feels like cheating, this would be it.
- Salted Sweetness: Here’s what sold me—the pinch of sea salt. It’s not just sweet; there’s this little pop of flavor that makes every bite taste like a bakery’s secret. My kids don’t even notice it’s there, but I always sneak in an extra sprinkle.
- Crowd-Pleaser Flex: This icing is my go-to for cupcakes, Rice Krispie treats, or even toasted bread. I’ve used it to glaze donuts, drizzle over fruit, and even as a filling for homemade candy bars. (Yes, even on a Tuesday night.)
- Pantry Staple Power: Between us, this recipe is my budget-friendly lifesaver. Condensed milk and marshmallows last forever, and I can make a whole batch for under five bucks. Plus, leftovers? Just pop them in the fridge and reheat—no waste, all flavor.
Step-by-step instructions for marshmallow-melted Rice Krispie icing
Here's how to create that signature fluffy, melt-in-your-mouth icing in record time.
Melt Butter and Marshmallows Over Low Heat
In a heavy-bottomed saucepan, combine the 0.5 cup unsalted butter and 10 oz large marshmallows. I use a saucepan with sloped sides to prevent spills—this stuff gets lively. Place the pan over low heat and stir constantly with a silicone spatula.
Watch for the marshmallows to begin melting and the mixture to transform into a smooth, glossy liquid. This should take about 3-4 minutes. If you see any marshmallows sticking to the bottom, add a few drops of water to help dissolve them completely. The mixture should look like a thick, golden syrup with no lumps remaining.
Add Condensed Milk and Salt
Once the marshmallows are fully melted, remove the pan from heat and let it cool for 1 minute. This prevents the condensed milk from curdling when added. Slowly whisk in the 1 cup sweetened condensed milk and 0.25 tsp fine sea salt. The salt balances the sweetness and enhances all the flavors.
Return the pan to low heat and stir continuously for 2-3 minutes until the mixture thickens slightly. You'll notice it becomes smoother and more cohesive—this is when it starts developing that signature Rice Krispie icing texture. The mixture should coat the back of a spoon but still be pourable.
Incorporate Flavorings and Optional Add-Ins
Remove the pan from heat again and stir in the 1 tsp vanilla extract and 2 tbsp peanut butter. The peanut butter adds a rich, nutty depth that pairs perfectly with the marshmallow sweetness. If you're using the 0.5 tsp food coloring, add it now and stir until completely dissolved and evenly distributed.
For the 2 oz white chocolate chips, I recommend folding them in at the very end using a rubber spatula. This creates beautiful swirls and pockets of white chocolate throughout the icing. If you want an even more professional look, melt the white chocolate separately and drizzle it over the finished icing.
Cool and Test for Perfect Consistency
Transfer the icing to a heatproof bowl and let it cool at room temperature for 10-15 minutes, stirring occasionally. The icing will thicken as it cools—this is normal. You want it to be thick enough to hold peaks when spread but still smooth and spreadable.
To test the consistency, dip a spoon into the icing and lift it. If it forms a soft peak that holds its shape but still flows slightly, it's ready. If it's too thick, warm it gently over low heat for 30 seconds and stir. If it's too thin, chill it another 5 minutes. The perfect icing should be like thick whipped cream—light, smooth, and just stable enough to pipe.
Pro Tips For Making Rice Krispie Icing
- Use Low Heat: The second you add marshmallows, drop the heat to medium-low. I learned this the hard way—burnt marshmallow flavor ruins everything, and you can’t salvage it. Watch the pot like a hawk; it should bubble gently, not roar.
- Toast Marshmallows First: Toss a handful of whole marshmallows into a dry pan over medium heat for 30 seconds before adding them to the pot. This jumpstarts the melting process and prevents clumping—no more scraping stubborn globs off the bottom.
- Salt the Condensed Milk: Mix a pinch of fine sea salt into the sweetened condensed milk before combining it with butter. It balances the sweetness and cuts through the richness, making the icing taste more sophisticated than the basic recipe.
- Scrape Constantly: Keep a rubber spatula in the pot the whole time, scraping the bottom and sides every 30 seconds. The icing sticks like glue when it cools, and you’ll regret skipping this step when you’re left with a lumpy mess. (Yes, even if you’re impatient like me.)
Wine and beer pairings for rice krispie icing
Sweet Icing & Light Lagers
Rice Krispie icing’s marshmallow richness pairs beautifully with light, crisp lagers that cut through the sweetness. I love Peroni or Sierra Nevada Pale Ale—their subtle hop bitterness balances the icing’s caramel notes without overpowering. The effervescence also cleanses your palate between bites of treats. 🍺
Chocolatey Icing & Dark Beer
If you add dark chocolate chips or cocoa powder to your icing, switch to a dark ale like Guinness or Samuel Adams Black Label. The roasted malt flavors complement the chocolate depth while the creamy texture of stout mirrors the icing’s smoothness.
Serve with chocolate-dipped Rice Krispie treats for a decadent pairing.
Citrus-Infused Icing & White Wine
Brighten your icing with lemon or orange zest and pair it with a dry Riesling or Sauvignon Blanc. The wine’s crisp acidity enhances the citrus notes, making it perfect for lemon-glazed Rice Krispie treats or iced cakes. A chilled glass elevates the dessert experience to restaurant-quality. 🍷
Peanut Butter Icing & Amber Ale
The nutty depth of peanut butter-infused icing calls for an amber ale like Fat Tire or New Belgium Fat Tire. The caramel and biscuit malt flavors in the beer mirror the peanut butter’s richness, creating a harmonious match. This pairing works especially well with peanut butter-filled Rice Krispie treats.
Classic Icing & Dessert Wine
For a sophisticated touch, drizzle your icing over port wine-soaked Rice Krispie treats and serve with a tawny port or Moscato d’Asti. The wine’s sweetness and oak notes amplify the icing’s marshmallow flavors, making it ideal for holiday desserts or special occasions.
A small glass enhances the dessert’s luxurious feel.
Nutrition facts
Frequently asked questions
Why does my Rice Krispie icing turn grainy?
Graininess usually happens when marshmallows aren't fully melted or when the mixture cools too quickly. Use low heat and stir constantly until completely smooth. If it starts thickening too fast, whisk in 1 teaspoon of warm water to restore that silky texture. Also, avoid using giant fluffy marshmallows—they melt unevenly.
Can I make this icing without condensed milk?
Yes! For a lighter version, replace the condensed milk with 1 cup powdered sugar mixed with 1 tablespoon milk or water. For extra richness, use ½ cup heavy cream whipped to soft peaks instead. The texture will be slightly different but still delicious for drizzling or decorating.
How do I fix icing that's too thick or too thin?
If your icing is too thick, warm it gently over low heat for 30 seconds while stirring. For thin icing, chill it for 5-10 minutes or add 1 tablespoon powdered sugar at a time until it reaches a spreadable consistency. The perfect texture should hold soft peaks but still flow smoothly from a piping bag.
What are the best ways to use leftover icing?
Leftover icing is perfect for glazing Rice Krispie treats, drizzling over pancakes, or filling between cookies. For extra flair, melt white chocolate and drizzle over the icing before it sets. Store leftovers in an airtight container in the fridge for up to 5 days—just reheat gently before using.
Can I make this icing vegan?
Swap the butter for vegan margarine or coconut oil, use vegan marshmallows, and replace condensed milk with coconut condensed milk or a mix of coconut cream and powdered sugar. The texture will be slightly different but still works beautifully for vegan treats or as a glaze.