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If you’re craving a fun, zesty twist on a classic treat, the Key Lime Pie Rice Krispie Treats Recipe is a total game-changer. This dessert brilliantly marries the nostalgic chewiness of traditional Rice Krispie treats with the bright, tangy flavors of fresh lime juice and zest, delivering a refreshing burst with every bite. Whether you’re whipping these up for a summer gathering or just because you want a citrusy snack, these treats are a delightfully simple way to add some tropical sunshine to your day.

Ingredients You’ll Need
The beauty of this recipe lies in its simplicity and the way each ingredient plays a key role. From the gooey marshmallows that bind it all together to the crisp crunch of Rice Krispies, each element contributes to the iconic texture and flavor. The star lime juice and zest bring a lively, tangy pop that transforms this treat into something truly special and vibrant.
- 3 tbsp butter: Provides richness and helps melt the marshmallows evenly for that perfect gooey texture.
- 1 package mini marshmallows: Acts as the delicious glue that holds everything together with that classic chewy softness.
- 6 cups Rice Krispies cereal: Adds the iconic crispy crunch that everyone loves in every bite.
- 1/4 cup lime juice: Infuses the treat with a fresh, tangy zing that brightens up the whole dessert.
- 1/4 tsp lime zest: Intensifies the lime flavor with aromatic oils, bringing that authentic key lime pie essence.
- 1/2 cup white chocolate chips (optional): Adds a sweet, creamy drizzle that contrasts beautifully with the tart lime.
How to Make Key Lime Pie Rice Krispie Treats Recipe
Step 1: Melt Butter and Marshmallows
Start by melting the butter in a large pot over medium heat. Once it’s melted, toss in the mini marshmallows and stir constantly until everything is smooth and completely melted together. This step is where the magic starts, creating that soft base that will hold your treats perfectly.
Step 2: Stir in Lime Juice and Zest
Remove the pot from heat and immediately add your fresh lime juice and zest. Stir enthusiastically to combine so the lime flavor infuses the marshmallow mixture, giving your treats that unmistakable key lime pie zing.
Step 3: Mix in Rice Krispies Cereal
Quickly add the Rice Krispies cereal to the pot. Gently but thoroughly stir the cereal into the marshmallow mixture, making sure every piece is evenly coated for consistent flavor and crunch in every bite.
Step 4: Press Into Baking Pan
Transfer the sticky mixture into a greased 9×13-inch baking pan. Use a spatula or clean hands (lightly greased to prevent sticking) to press the mixture firmly and evenly into the pan. Pressing firmly ensures your treats hold together well when cut.
Step 5: Cool Completely
Allow your treats to cool fully at room temperature. This step is crucial because it helps the mixture firm up, making it easier to slice cleanly into those perfect squares everyone loves.
Step 6: Optional White Chocolate Drizzle
If you’re feeling extra indulgent, melt the white chocolate chips and drizzle them over the cooled bars. This adds a luscious sweetness that balances the tart key lime beautifully and makes your treats look irresistibly fancy.
How to Serve Key Lime Pie Rice Krispie Treats Recipe

Garnishes
To elevate your Key Lime Pie Rice Krispie Treats Recipe, sprinkle a little extra lime zest on top or add a few candied lime slices for an eye-catching, flavorful garnish. A light dusting of shredded coconut can also add a tropical twist that pairs perfectly with the lime.
Side Dishes
Serve these treats alongside a fresh fruit salad with pineapple and mango or a chilled coconut milk smoothie. The pairing amplifies the tropical vibe and balances the intense lime flavor with refreshing, natural sweetness.
Creative Ways to Present
Try cutting your treats into fun shapes using cookie cutters or presenting them layered in clear cups with whipped cream and lime zest for a playful parfait-style dessert. For parties, stacking these squares on a decorative platter with fresh mint leaves makes a vibrant, crowd-pleasing display.
Make Ahead and Storage
Storing Leftovers
Once cut, store any leftover Key Lime Pie Rice Krispie Treats in an airtight container at room temperature. They stay perfectly chewy for up to three days, making them ideal for prepping in advance or enjoying as an easy snack later in the week.
Freezing
If you want to keep these treats longer, wrap individual squares tightly in plastic wrap and place them in a freezer-safe bag. They freeze well for up to a month. Just thaw at room temperature before enjoying to retain that classic chewy texture.
Reheating
While these treats are best served at room temperature or chilled, if you prefer a softer, gooier bite, pop them in the microwave for about 10 seconds. Be cautious not to overheat, or they may become too sticky and lose their signature texture.
FAQs
Can I use regular marshmallows instead of mini marshmallows?
Absolutely! Regular marshmallows work just fine; simply chop them into smaller pieces to help them melt faster and blend evenly with the butter.
What can I substitute for lime juice if I don’t have any?
Fresh lemon juice can be used in a pinch, but for the authentic Key Lime Pie Rice Krispie Treats Recipe, lime juice is best for that distinctive tart flavor.
Is the white chocolate drizzle necessary?
Not at all! It’s totally optional, but it adds a nice sweet contrast that complements the lime’s tanginess beautifully.
How do I prevent the marshmallow mixture from sticking to my hands when pressing it into the pan?
Lightly grease your hands with butter or non-stick spray before pressing the mixture. This keeps it from sticking and helps you press it down firmly and evenly.
Can I make this recipe gluten-free?
Yes! Just ensure that the Rice Krispies cereal you use is labeled gluten-free, and the rest of the ingredients are naturally gluten-free as well.
Final Thoughts
Making this Key Lime Pie Rice Krispie Treats Recipe is like catching a little burst of sunshine in dessert form. The perfect balance of citrus zing, gooey marshmallow, and crispy cereal is so satisfying and downright fun to eat. I can’t wait for you to try these for yourself—they’re bound to become a go-to favorite whenever you want a quick and cheerful treat with a tropical twist.
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Key Lime Pie Rice Krispie Treats Recipe
- Prep Time: 10 minutes
- Cook Time: 10 minutes
- Total Time: 20 minutes
- Yield: 16 servings
- Category: Dessert
- Method: Stovetop
- Cuisine: American
Description
These Key Lime Pie Rice Krispie Treats are a zesty twist on the classic marshmallow cereal bars, combining tangy lime juice and zest with the crunchy sweetness of Rice Krispies. A quick and easy no-bake treat that’s perfect for parties or a refreshing dessert.
Ingredients
Main Ingredients
- 3 tbsp butter
- 1 package mini marshmallows (approximately 10 oz)
- 6 cups Rice Krispies cereal
- 1/4 cup lime juice (freshly squeezed for best flavor)
- 1/4 tsp lime zest
- 1/2 cup white chocolate chips (optional, for drizzling)
Instructions
- Melt butter and marshmallows: In a large pot over medium heat, melt the butter and mini marshmallows together, stirring constantly until the mixture is smooth and completely melted.
- Add lime flavor: Remove the pot from heat and promptly stir in the lime juice and lime zest until fully incorporated, giving the mixture a fresh citrus punch.
- Combine with cereal: Add the Rice Krispies cereal to the pot and stir carefully to coat the cereal evenly with the marshmallow and lime mixture.
- Press mixture into pan: Transfer the coated cereal mixture into a greased 9×13-inch baking pan. Use a spatula or your hands (lightly greased or dampened) to press the mixture down firmly and evenly.
- Cool and set: Allow the mixture to cool completely at room temperature, so the treats firm up and are easier to cut.
- Optional white chocolate drizzle: If desired, melt the white chocolate chips gently and drizzle over the cooled bars for an extra layer of sweetness and decoration.
Notes
- For best zesting results, use a microplane to finely grate the lime peel, avoiding the bitter white pith.
- Press the mixture firmly into the pan to help the treats hold their shape better after cooling.
- Use fresh lime juice for the brightest and most authentic flavor.
- The white chocolate drizzle adds sweetness but can be omitted for a less sugary option.
- Store leftovers in an airtight container at room temperature for up to 3 days to maintain freshness and texture.

