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Keto Lemon Mousse (Sugar-Free

  • Prep Time: 15 minutes

  • Chill Time: 2 hours

  • Total Time: 2 hours 15 minutes

  • Course: Dessert

  • Cuisine: Modern / Keto

  • Servings: 4 generous servings

  • Calories: 245 kcal per serving

Why You Will Love This Recipe

  • Zero Sugar, Full Flavor: Sweetened naturally with monk fruit or erythritol, keeping your blood sugar stable.

  • Luxurious Texture: Heavy whipping cream whipped to stiff peaks creates a mousse that is cloud-like and light.

  • Quick and Easy: No gelatin or complicated tempering of eggs required—just whip, fold, and chill!

  • Keto-Friendly: Extremely low in net carbs, making it an ideal post-dinner treat that won’t kick you out of ketosis.

Equipment Needed

  • Stand mixer or handheld electric beaters

  • Mixing bowls (glass or metal work best when chilling)

  • Microplane zester

  • Citrus juicer

  • Silicone spatula

  • Serving glasses or ramekins

Ingredients

For the Mousse Base:

  • 1 cup (240ml) heavy whipping cream (very cold)

  • 4 oz (113g) cream cheese, softened to room temperature

  • 1/3 cup powdered erythritol or powdered monk fruit sweetener (adjust to taste)

  • 3 tbsp fresh lemon juice (about 1.5 medium lemons)

  • 1 tbsp fresh lemon zest

  • 1 tsp pure vanilla extract

  • A tiny pinch of sea salt (to balance and enhance the citrus notes)

Optional Garnish:

  • Extra lemon zest or thin lemon twists

  • A dollop of extra whipped cream

  • Fresh mint leaves

Step-by-Step Instructions

Step 1: Whip the Heavy Cream

  1. Pour the 1 cup of very cold heavy whipping cream into a chilled mixing bowl.

  2. Using an electric mixer fitted with the whisk attachment, beat the cream on medium-high speed until stiff peaks form.

  3. Be careful not to overwhip, or it will turn into butter. Once it holds its shape firmly, set it aside in the refrigerator.

Step 2: Beat the Cream Cheese and Sweetener

  1. In a separate, larger mixing bowl, combine the softened cream cheese and powdered erythritol/monk fruit sweetener.

  2. Beat on medium speed for 1 to 2 minutes until completely smooth, creamy, and free of any lumps. Scrape down the sides of the bowl with a spatula as needed.

Step 3: Incorporate the Lemon and Vanilla

  1. Add the fresh lemon juice, lemon zest, pure vanilla extract, and pinch of sea salt to the cream cheese mixture.

  2. Beat again on medium speed until fully incorporated and smooth. Taste the mixture at this stage; if you prefer a tarter mousse, you can add a tiny splash more lemon juice.

Step 4: Fold and Combine

  1. Take your whipped cream out of the refrigerator.

  2. Gently fold about one-third of the whipped cream into the lemon cream cheese mixture to lighten it up. Use a silicone spatula and a gentle cutting-and-folding motion to preserve the air.

  3. Add the remaining whipped cream and fold gently until a uniform, fluffy, pale-yellow mousse is formed. Ensure no streaks of white cream remain, but do not over-mix or you will deflate the mousse.

Step 5: Chill and Set

  1. Spoon or pipe the mousse evenly into 4 serving glasses, ramekins, or dessert cups.

  2. Place the glasses in the refrigerator to chill for at least 2 hours to allow the flavors to meld and the mousse to firm up into a luxurious texture.

Pro Tips for Success

  • Use Powdered Sweetener: Always use powdered sweetener rather than granular. Granular sugar substitutes will not dissolve properly in the cold cream cheese mixture and will leave a gritty texture on your tongue.

  • Chill Your Bowl: For the best and fastest whipping results with your heavy cream, place your mixing bowl and beaters in the freezer for 10-15 minutes before starting.

  • Fresh is Best: Always use freshly squeezed lemon juice and fresh zest. Bottled lemon juice lacks the bright, aromatic oils needed for an authentic, vibrant flavor.

Variations and Customizations

  • Berry Layer: Layer the bottom of your serving glasses with a few fresh raspberries or blackberries before piping the lemon mousse on top for a beautiful presentation and a tart fruit contrast.

  • Lemon Curd Swirl: For an extra burst of flavor, swirl a spoonful of sugar-free keto lemon curd through the mousse just before chilling.

  • Crunchy Crust: Create a layered “lemon pie” dessert by putting a base of crushed pecans mixed with melted butter and sweetener at the bottom of the glass.

Storage and Meal Prep

  • Refrigerator: Store covered tightly with plastic wrap in the refrigerator for up to 3 to 4 days. The mousse holds its texture remarkably well over a few days.

  • Freezer: Freezing is not recommended, as the high fat content from the heavy cream and cream cheese can separate and change texture upon thawing.

Nutritional Information

Serving Size: 1 of 4 servings

  • Calories: 245 kcal

  • Total Fat: 24.5g

  • Saturated Fat: 15.2g

  • Cholesterol: 72mg

  • Sodium: 95mg

  • Total Carbohydrates: 3.2g

  • Dietary Fiber: 0.4g

  • Sugars: 1.2g (Naturally occurring from dairy and fresh lemon)

  • Net Carbs: 2.8g per serving

  • Protein: 3.1g

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