This Sugar-Free No-Bake Key Lime Lush is a bright, creamy dessert with a buttery sugar-free graham cracker crust, fluffy cream cheese layer, smooth lime filling, and light whipped topping. It is refreshing, easy to make ahead, and perfect for summer gatherings, potlucks, or celebrations.

Made with sugar-free graham cracker crumbs, cream cheese, sugar-free condensed milk, sour cream, and fresh key lime juice, this lush delivers bold citrus flavor without regular sugar. The no-bake method means minimal effort and maximum flavor, with a texture that is both creamy and satisfying.

It is delicious chilled, with optional garnishes like fresh key lime zest or thin lime slices for a beautiful, vibrant finish.

Why You’ll Love This Key Lime Lush

One of the best things about this recipe is how easy it is. There is no baking required for the filling or topping, and the crust comes together in minutes.

The flavor is bright and refreshing. Fresh key lime juice and zest create a vibrant citrus taste that feels light and summery.

It is also very versatile. You can serve it as a light dessert, a sweet snack, or a special treat for brunch. The make-ahead nature makes it ideal for busy schedules and summer entertaining.

What Makes This Lush Sugar-Free?

This recipe uses sugar-free graham cracker crumbs, sugar-free condensed milk, and sugar-free sweeteners instead of regular sugar. Allulose, monk fruit, erythritol blends, or other baking-friendly sugar substitutes can work well.

The crust is made with melted butter and a touch of sugar-free sweetener, keeping it lower in carbs and sugar. The filling relies on the natural tang of key lime juice and the sweetness of sugar-free condensed milk.

The result is a dessert that tastes like a classic key lime pie but fits better into sugar-free and lower-carb eating plans.

Ingredients You Need

This lush has four main components: a buttery graham cracker crust, a fluffy cream cheese layer, a smooth key lime filling, and a light whipped topping.

Crust (Sugar-Free)

1 1/2 cups sugar-free graham cracker crumbs
2 tbsp granulated sugar-free sweetener
1/2 cup butter, melted

Cream Cheese Layer (Sugar-Free)

16 oz cream cheese, softened
1 cup powdered sugar-free sweetener
1/2 tsp vanilla extract
8 oz sugar-free whipped topping, thawed

Key Lime Layer (Sugar-Free)

1 1/2 cups sugar-free condensed milk
1/2 cup sour cream
1/4 cup fresh key lime juice
2 tsp key lime zest

Topping

8 oz sugar-free whipped topping, thawed
Fresh key lime zest or thin lime slices, optional

The crust is buttery and crisp, the cream cheese layer is fluffy and sweet, the lime filling is smooth and tangy, and the whipped topping is light and airy.

How to Make Sugar-Free No-Bake Key Lime Lush

This lush is assembled in layers and then chilled until set.

Make the Crust

Lightly grease a 9×13-inch baking dish.

Mix sugar-free graham cracker crumbs, granulated sugar-free sweetener, and melted butter in a medium bowl.

Press the mixture firmly and evenly into the bottom of the prepared dish. Use the bottom of a measuring cup or glass to compact it evenly.

Place the crust in the freezer while preparing the cream cheese layer. This helps the crust set and stay firm.

Make the Cream Cheese Layer

Beat the softened cream cheese, powdered sugar-free sweetener, and vanilla extract until smooth.

Fold in the sugar-free whipped topping until fully combined and fluffy.

Spread evenly over the chilled crust.

Place the dish back in the freezer while making the lime filling. This helps the cream cheese layer set quickly.

Make the Key Lime Layer

Whisk sugar-free condensed milk and sour cream together until smooth.

Add key lime juice and key lime zest.

Whisk only until fully combined and lightly thickened. Do not overmix, which can make the filling thinner.

Spread the lime filling evenly over the cream cheese layer.

Add the Topping

Spread the remaining sugar-free whipped topping evenly over the key lime layer.

Cover the dish and refrigerate for at least 6 hours, preferably overnight.

Garnish and Serve

Add lime zest or thin lime slices just before serving, if desired.

Slice into squares and serve chilled.

Texture and Flavor

This key lime lush has a buttery, crisp crust, a fluffy cream cheese layer, a smooth and tangy lime filling, and a light whipped topping. The crust is compact and holds the layers together, while the cream cheese layer is rich and sweet.

The key lime filling is bright and citrusy, with fresh key lime juice and zest providing a vibrant taste. The whipped topping adds lightness and balance to the richness of the layers below.

Served chilled, it feels refreshing and indulgent at the same time.

Tips for the Best Results

A few small details can help your key lime lush turn out perfectly.

Use Softened Cream Cheese

Use fully softened cream cheese for a smooth, lump-free layer. Cold cream cheese will not beat smoothly.

Use Fresh Key Lime Juice

Use fresh key lime juice and zest for the brightest flavor. Bottled juice will work but may taste less vibrant.

Do Not Overmix

Do not overmix the lime filling, which can make it thinner. Whisk only until combined and lightly thickened.

Press the Crust Firmly

Press the crust firmly so it stays compact beneath the creamy layers. A loose crust can crumble when slicing.

Chill Overnight

Chill for at least 6 hours, or preferably overnight, for the firmest filling and cleanest slices.

Use a Warm Knife

Run a knife under warm water and wipe clean between cuts for neat servings. This prevents smearing and keeps the layers distinct.

Easy Variations

This recipe is easy to customize with different flavors and toppings.

Add Blueberries

Top with fresh blueberries for a key lime-blueberry version.

Add Raspberries

Use fresh raspberries instead of blueberries for a key lime-raspberry twist.

Add Coconut

Sprinkle unsweetened shredded coconut on top for a tropical touch.

Make It Dairy-Free

Use dairy-free cream cheese, coconut cream, and dairy-free whipped topping for a dairy-free version.

Add Mint

Garnish with fresh mint leaves for a refreshing finish.

Serving Ideas

This key lime lush is best served chilled. A garnish of fresh key lime zest or thin lime slices makes it look and taste extra special.

It is perfect for summer picnics, barbecues, holiday gatherings, or any time you want a bright, refreshing dessert. Because it is made in a 9×13 pan, it is easy to cut into squares for serving a crowd.

Storage Tips

Store leftovers tightly covered in the refrigerator for up to 3 days.

Keep the lush covered with plastic wrap or transfer individual squares to an airtight container.

For the best texture, serve it chilled. The flavor becomes more vibrant as it sits.

Nutrition Information

Approximate nutrition per serving, based on 12 servings:

Calories: ~255
Net Carbs: ~9g
Protein: ~5g
Fat: ~23g
Fiber: ~1g
Total Carbs: ~10g

Nutrition may vary depending on the brands of sweeteners, condensed milk, and other ingredients you use.

Common Mistakes to Avoid

A few simple mistakes can affect the texture of this key lime lush.

Not Softening the Cream Cheese

If the cream cheese is not softened, the layer will be lumpy. Let it come to room temperature before beating.

Overmixing the Lime Filling

Overmixing can make the lime filling too thin. Whisk only until combined and lightly thickened.

Not Chilling Long Enough

The lush needs at least 6 hours to set. Chilling overnight gives the firmest filling and cleanest slices.

Loose Crust

Press the crust firmly so it stays compact. A loose crust can crumble when slicing.

Using Bottled Lime Juice

Fresh key lime juice tastes brighter than bottled. Use fresh juice for the best flavor.

FAQ

Can I make this ahead of time?

Yes. This lush is perfect for making ahead. Prepare it the day before and chill until serving.

Can I freeze key lime lush?

Yes. Freeze the untopped lush for up to 2 months. Thaw in the refrigerator before adding the whipped topping and serving.

Can I use regular graham cracker crust?

Yes. You can use regular graham cracker crumbs if you are not following a sugar-free plan. The texture will be different but still delicious.

Why is my lime filling too thin?

The filling may not have chilled long enough, or it was overmixed. Make sure to chill thoroughly and whisk only until combined.

Can I use regular lime juice?

Yes. Regular lime juice will work, but key lime juice has a distinct, brighter flavor. Use key lime juice for the authentic taste.

Why This Recipe Works

This Sugar-Free No-Bake Key Lime Lush works because the buttery graham cracker crust provides a crisp base, while the cream cheese layer is fluffy and sweet. The key lime filling is smooth and tangy, and the whipped topping adds lightness and balance.

It is easy to make ahead, perfect for summer gatherings, and ideal for anyone who wants a cool, creamy dessert without regular sugar. For a refreshing, make-ahead treat that tastes like sunshine, this key lime lush is a delicious choice.

Sugar-Free No-Bake Key Lime Lush Recipe

Author: chef Jennifer
Total Time: 365 minutes (includes minimum 6-hour chilling time)
Yield: 12 servings 1x

Print Recipe

Description

This Sugar-Free No-Bake Key Lime Lush is a bright, creamy layered dessert made with a buttery sugar-free graham cracker crust, fluffy cream cheese layer, tangy key lime filling, and light whipped topping. Made without regular sugar and chilled until perfectly set, it is an easy make-ahead dessert that’s perfect for summer gatherings, potlucks, barbecues, and celebrations.

Ingredients

Scale

For the Sugar-Free Graham Cracker Crust

1 1/2 cups sugar-free graham cracker crumbs
2 tablespoons granulated sugar-free sweetener
1/2 cup butter, melted

For the Cream Cheese Layer

16 ounces cream cheese, softened
1 cup powdered sugar-free sweetener
1/2 teaspoon vanilla extract
8 ounces sugar-free whipped topping, thawed

For the Key Lime Layer

1 1/2 cups sugar-free condensed milk
1/2 cup sour cream
1/4 cup fresh key lime juice
2 teaspoons key lime zest

For the Topping

8 ounces sugar-free whipped topping, thawed
Fresh key lime zest or thin lime slices, optional

Instructions

Lightly grease a 9×13-inch baking dish.
In a medium bowl, combine the sugar-free graham cracker crumbs, granulated sugar-free sweetener, and melted butter.
Press the crust mixture firmly and evenly into the bottom of the prepared dish. Use the bottom of a measuring cup or glass to compact the crust.
Place the crust in the freezer while preparing the cream cheese layer.
Beat the softened cream cheese, powdered sugar-free sweetener, and vanilla extract until smooth and creamy.
Gently fold in 8 ounces of thawed sugar-free whipped topping until fully combined and fluffy.
Spread the cream cheese mixture evenly over the chilled crust.
Return the dish to the freezer while preparing the key lime layer.
Whisk the sugar-free condensed milk and sour cream together until smooth.
Add the fresh key lime juice and key lime zest. Whisk only until combined and lightly thickened. Do not overmix.
Spread the key lime mixture evenly over the cream cheese layer.
Spread the remaining 8 ounces of sugar-free whipped topping evenly over the lime layer.
Cover and refrigerate for at least 6 hours, preferably overnight.
Just before serving, garnish with fresh key lime zest or thin lime slices, if desired.
Slice into squares and serve chilled. For clean slices, run a knife under warm water, wipe it dry, and repeat between cuts.

Notes

Use fully softened cream cheese for the smoothest cream cheese layer.
Fresh key lime juice and zest provide the brightest citrus flavor. Regular lime juice can be substituted if necessary.
Avoid overmixing the key lime filling, as excessive mixing may make it thinner.
Press the crust firmly into the pan so it holds together when sliced.
Chill for at least 6 hours; overnight chilling gives the firmest texture and cleanest slices.
Store tightly covered in the refrigerator for up to 3 days.
To freeze, freeze the lush without the final whipped topping for up to 2 months. Thaw in the refrigerator, then add the topping before serving.
For variations, add fresh blueberries, raspberries, unsweetened shredded coconut, or fresh mint.
For a dairy-free version, use dairy-free cream cheese, coconut cream, and dairy-free whipped topping.
Sugar-free sweeteners such as allulose, monk fruit, or erythritol blends may be used according to package conversion recommendations.
Nutrition values are estimates and can vary considerably depending on the brands and specific sugar-free products used.

Prep Time: 25 minutes
Cook Time: 0 minutes
Category: Dessert
Cuisine: American

Nutrition

Serving Size: 1 square
Calories: 255 per serving
Fat: 23g per serving
Carbohydrates: 10g per serving
Fiber: 1g per serving
Protein: 5g per serving

Keywords: Sugar-Free No-Bake Key Lime Lush

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