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Prep Time: 15 minutes
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Chill Time: 2 hours
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Total Time: 2 hours 15 minutes
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Course: Dessert
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Cuisine: Modern / Keto
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Servings: 4 generous servings
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Calories: 245 kcal per serving
Why You Will Love This Recipe
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Zero Sugar, Full Flavor: Sweetened naturally with monk fruit or erythritol, keeping your blood sugar stable.
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Luxurious Texture: Heavy whipping cream whipped to stiff peaks creates a mousse that is cloud-like and light.
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Quick and Easy: No gelatin or complicated tempering of eggs required—just whip, fold, and chill!
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Keto-Friendly: Extremely low in net carbs, making it an ideal post-dinner treat that won’t kick you out of ketosis.
Equipment Needed
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Stand mixer or handheld electric beaters
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Mixing bowls (glass or metal work best when chilling)
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Microplane zester
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Citrus juicer
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Silicone spatula
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Serving glasses or ramekins
Ingredients
For the Mousse Base:
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1 cup (240ml) heavy whipping cream (very cold)
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4 oz (113g) cream cheese, softened to room temperature
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1/3 cup powdered erythritol or powdered monk fruit sweetener (adjust to taste)
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3 tbsp fresh lemon juice (about 1.5 medium lemons)
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1 tbsp fresh lemon zest
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1 tsp pure vanilla extract
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A tiny pinch of sea salt (to balance and enhance the citrus notes)
Optional Garnish:
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Extra lemon zest or thin lemon twists
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A dollop of extra whipped cream
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Fresh mint leaves
Step-by-Step Instructions
Step 1: Whip the Heavy Cream
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Pour the 1 cup of very cold heavy whipping cream into a chilled mixing bowl.
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Using an electric mixer fitted with the whisk attachment, beat the cream on medium-high speed until stiff peaks form.
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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
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In a separate, larger mixing bowl, combine the softened cream cheese and powdered erythritol/monk fruit sweetener.
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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
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Add the fresh lemon juice, lemon zest, pure vanilla extract, and pinch of sea salt to the cream cheese mixture.
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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
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Take your whipped cream out of the refrigerator.
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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.
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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
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Spoon or pipe the mousse evenly into 4 serving glasses, ramekins, or dessert cups.
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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
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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.
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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.
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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
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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.
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Lemon Curd Swirl: For an extra burst of flavor, swirl a spoonful of sugar-free keto lemon curd through the mousse just before chilling.
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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
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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.
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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
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Calories: 245 kcal
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Total Fat: 24.5g
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Saturated Fat: 15.2g
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Cholesterol: 72mg
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Sodium: 95mg
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Total Carbohydrates: 3.2g
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Dietary Fiber: 0.4g
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Sugars: 1.2g (Naturally occurring from dairy and fresh lemon)
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Net Carbs: 2.8g per serving
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Protein: 3.1g