Rice Krispie Treats with Marshmallow Fluff

You’ll love this recipe if you like this Applesauce Coffee Cake.

Rice Krispie treats with marshmallow fluff stay soft and stretchy even after they cool, rather than turning firm or dry at the edges. The marshmallow fluff melts easily with butter over low heat, so you get a smooth mixture that’s ready for the cereal in just a few minutes. It’s the kind of recipe you can pull together quickly for weeknight desserts, last-minute plans, or lunchbox treats.

You can keep the bars extra soft or stir in a little more cereal if you like a firmer bite. The mixture spreads easily into the pan, and a light press keeps the bars thick without packing them down. Even beginners will find the process simple, since most of the work is just gentle stirring on the stove.

➡️ Ingredients you’ll need

⏲ How to make these Rice Krispie treats with marshmallow fluff

✨ Variations

• Peanut butter: Stir a few tablespoons of peanut butter into the melted fluff mixture before adding the cereal.
• M&M or candy mix-ins: Fold in mini M&Ms or chopped candy bars after the cereal has cooled for a minute.
• Salty-sweet: Sprinkle a little flaky salt on top right after pressing the mixture into the pan.
• Holiday version: Use seasonal sprinkles or colored candy to match the occasion.

〰️ How to serve

• Extra Marshmallow — Add a handful of mini marshmallows when mixing in the cereal for softer pockets.
• Chocolate — Stir in mini chocolate chips after mixing the cereal (let the mixture cool 1-2 minutes first).
• Sprinkles — Fold in rainbow sprinkles for a birthday-style bar.

💬 FAQs

🍽 Recipe

Rice Krispie Treats with Marshmallow Fluff

Prep Time: 10 minutes minutes

Cook Time: 10 minutes minutes

Cooling Time: 30 minutes minutes

Total Time: 50 minutes minutes

Yield: 16 slices

Course: Dessert

Cuisine: American

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These Rice Krispie Treats with Marshmallow Fluff have a soft, stretchy texture and come together with very little effort. Everything melts together smoothly in one pot, and the mixture presses easily into a 9×13 pan for thick, airy bars. They’re great for weeknights, lunchboxes, or whenever you want something sweet without much prep.

Ingredients 

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• ▢ 6 Tablespoons unsalted butter, cut into pieces
• ▢ 2 7-ounce jars marshmallow fluff
• ▢ ¼ teaspoon fine salt
• ▢ 1 teaspoon vanilla extract
• ▢ 7 cups crisped rice cereal, plus up to 1 cup more as needed

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Instructions 

• Prep Pan: Line a 9×13-inch pan with parchment, leaving an overhang. Lightly spray parchment and a spatula so the mixture doesn’t stick.
• Melt Butter: In a large pot over low heat, melt 6 Tablespoons unsalted butter for 2-3 minutes. Keep heat low so butter stays pale and doesn’t sizzle.
• Loosen Fluff (If Needed): If the fluff feels stiff, set the closed jar in warm water for a few minutes to soften it. This makes it easier to scoop and helps it melt evenly.
• Melt Fluff Into Butter: Add 2 7-ounce jars marshmallow fluff to the pot. Stir constantly on low heat until mixture is completely smooth, about 3-5 minutes.
• Season Mixture: Stir in ¼ teaspoon fine salt and 1 teaspoon vanilla extract until combined.
• Add Cereal (First Portion): Take pot off stovetop heat. Add 7 cups crisped rice cereal and fold gently until everything is coated. If it still looks too loose or overly sticky, add up to 1 extra cup of cereal, a little at a time, folding after each addition. Stop when the mixture holds soft mounds. If it firms up too quickly, warm it briefly over very low heat.
• Press Into Pan: Transfer mixture to prepared pan. Lightly press it into an even layer with your sprayed spatula or greased hands. (Pressing too firmly can make the bars compact — I like to press just enough to help them settle while still staying airy.)
• Cool and Slice: Let pan cool at room temperature for about 25-30 minutes. Lift the slab out using the parchment and slice into squares, then serve.

Recipe Notes

Storage: Store bars in an airtight container at room temperature for up to 3 days. Separate layers with parchment so the bars don’t stick together.

Freezing: Rice Krispie treats freeze well. Wrap each bar individually, place them in a freezer bag, and thaw at room temperature. They’ll soften again as they warm.

Nutrition

Serving: 44g, Calories: 146kcal (7%), Carbohydrates: 28g (9%), Protein: 1g (2%), Fat: 4g (6%), Saturated Fat: 3g (19%), Polyunsaturated Fat: 0.2g, Monounsaturated Fat: 1g, Trans Fat: 0.2g, Cholesterol: 11mg (4%), Sodium: 37mg (2%), Potassium: 11mg, Fiber: 0.1g, Sugar: 15g (17%), Vitamin A: 131IU (3%), Calcium: 2mg, Iron: 0.2mg (1%)