Dessert

Key Lime Pie Rice Krispie Treats Recipe

ByClara Bennett March 23, 2026March 23, 2026

Introduction

These Key Lime Pie Rice Krispie Treats are a bright and tangy twist on the classic snack. Infused with fresh key lime juice and zest, they combine the nostalgic crunch of Rice Krispies with the refreshing flavors of a beloved pie. Perfect for summer gatherings or a zesty treat anytime.

The image shows three square treats made of puffed rice layered with a thin green layer inside, topped with a smooth white frosting. The frosting is decorated with small green sugar crystals and light brown toasted coconut flakes scattered evenly on top. The treats sit on a white marbled surface next to fresh lime wedges, suggesting a lime flavor. The texture looks crisp with the puffed rice and creamy with the frosting, highlighted by soft lighting. photo taken with an iphone --ar 4:5 --v 7

Ingredients

5 cups Rice Krispies cereal
10 cups mini marshmallows
5 tablespoons unsalted butter
1/2 cup key lime juice (fresh or bottled)
2 tablespoons key lime zest
1 cup graham cracker crumbs
1 cup white chocolate chips
1/2 teaspoon coconut oil (for smooth chocolate drizzle)
Optional add-ins: 1/2 cup coconut flakes
Optional add-ins: 1/4 cup crushed nuts
Optional add-ins: a few drops green food coloring

Instructions

Step 1: In a large saucepan over low heat, melt the butter. Add the mini marshmallows and stir continuously until the mixture is smooth and fully melted.
Step 2: Remove from heat and stir in the key lime juice and lime zest until well combined.
Step 3: Pour the melted marshmallow mixture over the Rice Krispies cereal in a large bowl. Gently fold the cereal into the mixture until it is fully coated, adding optional coconut flakes, crushed nuts, or green food coloring if desired.
Step 4: Spread the mixture evenly into a parchment-lined baking dish. Press gently with a spatula to create an even layer, but avoid over-packing to keep treats light and chewy.
Step 5: Sprinkle graham cracker crumbs evenly over the top of the pressed mixture.
Step 6: In a small bowl, melt the white chocolate chips with the coconut oil until smooth. Drizzle the melted white chocolate over the graham cracker crumbs.
Step 7: Refrigerate the treats for about 30 minutes to allow the topping to set.
Step 8: Once set, slice into squares and serve. Enjoy the bright, tangy flavors of these refreshing treats!

Tips & Variations

Use fresh key limes for the brightest flavor or bottled juice for convenience.
Add a few drops of green food coloring to the marshmallow mixture for a fun, vibrant look.
Try mixing in ½ cup of shredded coconut or ¼ cup of crushed nuts for extra texture.
Press the mixture lightly to keep the treats soft and chewy, avoiding over-compression.
For a richer chocolate drizzle, substitute white chocolate chips with a mix of white and milk chocolate.

Storage

Store the Key Lime Pie Rice Krispie Treats in an airtight container at room temperature for up to 3 days. If you prefer them chilled, keep them in the refrigerator and bring to room temperature before serving. These treats do not reheat well, so enjoy them fresh for the best texture and flavor.

How to Serve

The image shows three square treats made with crispy rice and a cream topping, each with two visible layers. The bottom layer consists of light golden crispy rice with a slightly glossy texture mixed with bits of pale green, giving a fresh look. On top of that is a thick smooth white cream layer, topped with small green and beige crunchy bits evenly scattered across the surface. The treats are placed on a white marbled surface with lime wedges in the background, adding a pop of green. photo taken with an iphone --ar 4:5 --v 7

Serve this delicious recipe with your favorite sides.

FAQs

Can I use regular lime juice instead of key lime?

Yes, regular lime juice works as a substitute, though the flavor will be slightly less tart and aromatic compared to true key lime juice.

Can I make these treats vegan or dairy-free?

To make a vegan or dairy-free version, use a plant-based butter alternative and vegan marshmallows. Ensure the white chocolate chips are also dairy-free or substitute with a vegan-friendly drizzle.