Mini Marshmallow Rice Crispy Recipe: Gooey Squares in Minutes

There’s a reason Rice Krispy treats remain a classic—they’re crispy, gooey, and impossibly satisfying. This version uses mini marshmallows for even more melty goodness in every bite.

I’ve perfected the ratio of marshmallows to cereal to ensure the ideal texture: snappy on the outside, soft and stretchy inside. The process takes 15 minutes from start to finish, with no baking required.

What you get is a batch of perfectly portioned squares that hold their shape but give way with the slightest pressure. The mini marshmallows melt faster, creating a smoother, more consistent binding.

These disappear faster than they cool. Here’s how to make them right every time.

Ingredients for Mini Marshmallow Rice Crispy

Six ingredients. One bowl. Endless crispy, gooey goodness.

The marshmallows are key here. Jet-Puffed mini marshmallows melt the fastest and most evenly—Kraft works too but takes a touch longer. Don’t skimp on the butter; it’s what gives these their rich, caramelized depth. I always grab Land O’Lakes unsalted so I can control the salt content. The cereal should be fresh (check the box date) and straight from the bag, not that stale stuff at the bottom.

No mini marshmallows? Regular ones work in a pinch but require a bit more patience to melt completely. Need to make it dairy-free? Earth Balance vegan butter swaps in perfectly. Out of vanilla? A pinch of cinnamon or almond extract adds a nice twist. The salt is non-negotiable though—it cuts through all that sweetness and makes the flavors pop.

These keep for 3 days at room temperature in an airtight container (if they last that long). For longer storage, wrap individual squares in parchment and freeze for up to 2 months. They’ll soften slightly but still taste amazing.

Step-by-Step Instructions for Mini Marshmallow Rice Crispy Treats

Here’s the method. Straightforward, tested, works every time.

Step 1: Prepare the Pan and Melt the Butter

Begin by generously coating a 9×13-inch baking pan with the cooking spray, ensuring all sides and corners are well covered. This prevents sticking and makes for easy removal later. I like to line the pan with parchment paper as well for extra insurance, but the spray alone works if you’re thorough.

In a large, heavy-bottomed pot, melt the 0.5 cup unsalted butter over low heat. Keep an eye on it—you want it fully melted but not browned. This takes about 3-4 minutes. Once melted, remove from heat immediately to prevent overheating.

Step 2: Melt the Mini Marshmallows

Add 8 cups of the mini marshmallows to the melted butter, reserving 2 cups for later. Stir constantly with a silicone spatula or wooden spoon until the marshmallows are nearly fully melted. This process takes about 5-7 minutes over low heat.

You’ll notice the mixture becomes glossy and smooth. I’ve found that mini marshmallows melt faster than regular ones due to their smaller size, so stay vigilant. If the mixture seems too thick, reduce the heat slightly. The key is patience—rushing this step can lead to scorching.

Step 3: Incorporate Flavor and Cereal

Once the marshmallows are fully melted, stir in the 2 tsp vanilla extract and 0.5 tsp fine sea salt. The vanilla adds a subtle depth of flavor, while the salt balances the sweetness perfectly. Mix well for 30 seconds to ensure even distribution.

Now, add all 6 cups Rice Krispies Cereal to the pot. Use your spatula to fold the cereal into the marshmallow mixture gently but thoroughly. The goal is to coat every piece of cereal evenly without crushing it. This should take about 1-2 minutes of stirring.

Step 4: Add Remaining Marshmallows and Press

Fold in the reserved 2 cups mini marshmallows into the cereal mixture. These will soften but retain some shape, giving your treats extra gooey pockets. The mixture should look uniformly coated with a few visible marshmallow pieces.

Transfer the mixture to your prepared pan. Using the spatula or a piece of parchment paper, press down firmly and evenly. I press for about 1 minute to ensure the treats are compact and hold together well. Avoid over-compressing, though, or they’ll be too dense.

Step 5: Cool and Cut

Let the treats cool at room temperature for 30-45 minutes. You’ll know they’re ready when the top is firm to the touch and the edges start to pull away from the pan slightly. This cooling time is crucial for clean cuts.

Once cooled, use a sharp knife to cut into squares. I like to make 12 equal squares for this 9×13-inch pan. For the cleanest cuts, dip the knife in warm water between slices. Serve immediately or store in an airtight container for up to 3 days.

Make-Ahead Tips for This Dish

Room Temperature Prep

Measure all your ingredients ahead of time and have them ready to go. I keep my 6 cups Rice Krispies in a large bowl and my 10 cups mini marshmallows divided into 8 cups and 2 cups portions. This makes the process smoother when you’re working with hot, sticky mixtures. 💡

Pre-Grease Everything

Before you start melting, spray your 9×13-inch pan liberally with cooking spray. Also coat your spatula and any measuring cups you’ll reuse. Trust me, this prevents a world of sticky cleanup later. I use Baker’s Joy spray for its flour-baking combination.

Melt Butter First

Start by melting your ½ cup unsalted butter completely before adding marshmallows. This ensures even melting and prevents hot spots that could burn your marshmallows. I find low heat gives me the most control.

Marshmallow Melting

Add your 8 cups mini marshmallows to the melted butter. Stir constantly until they’re almost fully melted before removing from heat. The residual heat will finish the job without risking scorching.

Press Evenly

When pressing the mixture into the pan, use a piece of parchment paper to avoid sticking. Press firmly for about 1 minute to create an even layer. I find wax paper works in a pinch too.

Cool Completely

Let your treats cool for the full 30-45 minutes before cutting. This patience ensures clean squares that hold their shape. The edges will start to pull away from the pan when they’re ready.

Frequently Asked Questions