Name: Keto Lemon Mousse
Prep time: 15 min
Total time: 1 h 15 min
Cuisine: American
Ingredients: 1 cup heavy whipping cream; 4 oz cream cheese, softened; 1/3 cup powdered erythritol (or keto sweetener of choice); 2 tablespoons fresh lemon juice; 1 teaspoon lemon zest

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This Keto Lemon Mousse is a light, fluffy, and zesty dessert that I love making when I want something sweet but still low in carbs. With only four simple ingredients, it comes together quickly and doesn’t require any complicated steps. It’s smooth, tangy, and perfectly balanced in flavor, making it one of my go-to treats when I’m craving something refreshing and satisfying.

Why You’ll Love This Recipe

I like this mousse because it’s incredibly easy to whip up with just a handful of ingredients. It’s the perfect dessert for anyone following a keto lifestyle or simply looking to reduce sugar without sacrificing taste. The texture is airy, and the lemon gives it a bright, clean finish that feels indulgent without being heavy. Whether I’m hosting guests or treating myself, this mousse never disappoints.

Ingredients

(Here’s a tip: Check out the full list of ingredients and measurements in the recipe card below.)

Heavy whipping cream
Cream cheese
Powdered erythritol (or preferred keto sweetener)
Fresh lemon juice and zest

Directions

I start by beating the heavy whipping cream until soft peaks form, then set it aside.
In another bowl, I beat the cream cheese until it’s smooth.
I add the powdered erythritol, lemon juice, and zest to the cream cheese, mixing until everything is well incorporated.
Then, I gently fold the whipped cream into the lemon-cream cheese mixture until it’s fully combined and fluffy.
I chill the mousse for at least an hour before serving for the best texture.

Servings and timing

This recipe makes about 4 servings. I usually prepare it in under 15 minutes, and it needs to chill for at least 1 hour in the refrigerator before serving. It’s a great make-ahead dessert that I can prepare earlier in the day or even the night before.

Variations

Sometimes I like to change things up by adding a splash of vanilla extract or substituting lime juice for lemon to make a keto lime mousse. If I want more texture, I top it with crushed keto-friendly cookies or toasted coconut flakes. Adding a dollop of extra whipped cream on top before serving also makes it feel extra special.

storage/reheating

I store any leftovers in an airtight container in the refrigerator for up to 3 days. I don’t recommend freezing it, as the texture can change once thawed. Since it’s best served chilled, there’s no need to reheat—just give it a quick stir if it settles and enjoy.

FAQs

How many carbs are in this keto lemon mousse?

Each serving typically contains around 3–4 grams of net carbs, depending on the sweetener and exact ingredient measurements I use.

Can I make this mousse ahead of time?

Yes, I often prepare it a day in advance and keep it chilled until I’m ready to serve. It holds up very well in the fridge.

What can I use instead of erythritol?

I sometimes use monk fruit sweetener or allulose as a substitute. I just make sure to adjust for sweetness, as different sweeteners vary in potency.

Can I make this dairy-free?

To make it dairy-free, I use coconut cream instead of heavy cream and a dairy-free cream cheese alternative. The texture changes slightly, but the flavor is still delicious.

Why is my mousse runny?

If my mousse turns out runny, it’s usually because the whipped cream wasn’t beaten enough, or I didn’t chill it long enough. I always make sure to beat the cream to soft peaks and let the mousse chill well before serving.

Conclusion

This Keto Lemon Mousse is everything I want in a dessert—quick, simple, and packed with bright flavor. It’s the kind of treat I can enjoy without guilt, whether I’m on a keto diet or just want a lighter option. With minimal prep and maximum taste, it’s a recipe I keep coming back to again and again.