Key Lime Mousse
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This Key Lime Mousse Recipe will tickle your taste buds and whisk you away to a tropical paradise. Creamy, dreamy, and bursting with zesty flavor, this no-bake dessert is like a vacation in a spoon. It’s a lime-infused masterpiece that will have you floating on a cloud of citrusy bliss.
Love this summer treat? Be sure to try my 5-Minute Strawberry Dessert, Mini Key Lime Cheesecakes, and Jello Grapes!
Why You’ll Love This Recipe
- Easy no-bake dessert: Perfect when you want something sweet without turning on the oven.
- Quick summer treat: Cool, refreshing, and ready in minutes—ideal for hot days.
This lime mousse is the kind of dessert that feels fancy but takes almost no effort. It’s light, fluffy, and bursting with bright citrus flavor. Like a key lime pie met a cloud and had a creamy, no-bake baby. It’s made with just a handful of ingredients and comes together in minutes.
It’s a go-to in our house for summer BBQs, holiday dinners, or whenever we want something sweet without the oven. You can dress it up in little jars with crushed graham crackers or keep it simple with a dollop of whipped cream. Either way, it disappears fast.
Ingredients You’ll Need
Believe it or not, you only need four simple ingredients to make this mousse recipe.
- Cream Cheese: This is what gives your mousse a little thickness and slight tang. You don’t need much, but it really brings things together.
- Sweetened Condensed Milk: The key ingredient to help tone down the tartness of the lime juice. It also is where the sweetness comes in to play.
- Key Lime Juice: Squeezing key limes to get enough juice can be quite the task, but is well worth it. However, you can also use bottled juice. This is most likely located in the baking aisle of your grocer.
- Heavy Cream: To get the light and fluffy texture, we’re whipping cream to stiff peaks. This is going to add air into the mousse providing that classic texture.
- Phyllo Dough Cups: Optional, but oh-so adorable. This is our favorite way to serve this recipe. They make for the perfect bites sized mousse dessert.
Jesseca’s Recipe Review
This lime mousse is pure sunshine in a cup. It’s light, tangy, and just sweet enough to hit that perfect balance. I’ve served it at baby showers, holidays, and random Tuesday nights—and it always gets rave reviews. Even my husband, who’s not big on desserts, asks for this one on repeat.
Tip from Jesseca:
For a fun twist, spoon the mousse into mini graham cracker crusts or serve it layered with crushed cookies. Instant key lime pie vibes, zero baking required.
What Is The Difference Between Limes And Key Limes?
First off, you will notice that regular limes, also known as Persians, are much larger than their Key Lime cousins. Besides the difference in size, what are the other main differences between the two? We dived into comparing and found that key limes have a more bold floral aroma, tend to be a little more yellow vs green, and pack a tart punch. That bold flavor is exactly what you need in this lime mousse recipe.
That being said, you can always substitute regular limes if you aren’t able to find Key Limes in your store. You will still get a wonderful citrus flavor. It will just be slightly less bold.
Best Key Lime Mousse Recipe
This lime mousse comes together in minutes and tastes like a slice of key lime pie in a cup. Here’s a quick peek at how it all comes together:
- Whip the cream: Beat heavy cream until stiff peaks form. This gives the mousse that light, airy texture.
- Mix the base: In a separate bowl, whisk together the cream cheese and sweetened condensed milk until smooth.
- Add the lime juice: Stir in the lime juice—it thickens the mixture and adds that signature tang.
- Fold in the whipped cream: Gently fold in the whipped cream to keep things fluffy.
- Chill or serve: Serve right away for a soft mousse or refrigerate for an hour to let it set even more.
That’s it! Five minutes and you’ve got a refreshing dessert that looks way more impressive than the effort it takes.
Helpful Tools
- Hand Mixer: While this definitely can be mixed by hand, a hand mixer (affiliate) will make it come together quickly and lump free.
- Silicone Spatulas: I swear by this set of silicone spatulas (affiliate). So handy for all of your baking projects as well as stove top cooking!
- Airtight Container: Saving the mousse for later? Be sure to invest in a quality airtight container (affiliate) to help keep it fresh longer.
Recipe FAQs
Yes, but fresh lime juice gives the best flavor and tang. Bottled will work in a pinch, especially if you’re short on time.
Not necessarily! You can serve it right away for a softer texture. But chilling for at least an hour helps it firm up and gives it more of a traditional mousse feel.
Freezing isn’t recommended—the texture gets grainy and loses that creamy, fluffy feel once thawed.
You can! Use about 2 cups of whipped topping (like Cool Whip) if you want to save time. Just note the flavor and texture will be slightly different.
It’ll keep well for up to 3 days in an airtight container. After that, it may start to separate or lose its fluffiness.
Storage and Make-Ahead Instructions
This lime mousse is a dream to prep ahead. In fact, it gets even better after a chill in the fridge.
- To make ahead: Prep the mousse up to 24 hours in advance and store it covered in the fridge. The flavors mellow and the texture firms up beautifully.
- To store leftovers: Keep any extras in an airtight container or individual jars in the fridge. It’ll stay fresh for up to 3 days—just give it a gentle stir if it starts to separate.
- Freezing isn’t recommended for this one. The texture won’t hold up well after thawing, so it’s best enjoyed chilled and fresh from the fridge.
Perfect for parties, last-minute desserts, or when you’re just thinking ahead.
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Key Lime Mousse Bites
Ingredients
- 4 oz cream cheese (softened)
- 2/3 cup sweetened condensed milk
- 1/4 cup fresh key lime juice
- 1/2 cup heavy cream (whipped)
- Phyllo dough cups (optional)
- Limes or fresh fruit for garnish (optional)
Instructions
- Using a stand mixer or hand mixer, beat the heavy whipping cream on high speed until stiff peaks form. Set aside.
- In a medium mixing bowl, combine the softened cream cheese and sweetened condensed milk. Whisk or beat with a hand mixer for about 30 to 40 seconds, until the mixture is completely smooth and no lumps remain.
- Pour in the fresh lime juice and stir until fully incorporated. The acidity will slightly thicken the base.
- Gently fold the whipped cream into the lime mixture using a spatula. Work slowly so you don’t deflate the mousse.
- You can serve immediately for a softer texture or refrigerate for at least 1 hour for a firmer, more mousse-like consistency.
Video
Notes
Nutrition
The nutrition facts provided are calculated using a third-party tool and are estimates only. Actual nutritional content may vary based on the ingredients and brands you use, as well as portion sizes. For accurate results, please consult a registered dietitian or nutritionist.
Can the mousse filling be put into a graham cracker crust and served as a pie?
I’m sure that you could do that and it would be delicious!
This recipe was a hit at my Christmas tea!
Hi Karen, I’m so glad to hear that! This one is one of my personal favorites.
I see sections of the recipe. I don’t see how to measure , cut, place the phillo. Help!
Hi Jackie, the phillo dough comes in pre baked cups. You can find them in the freezer section of most grocers. This recipe uses those.
These are sooooo easy and look so elegant. I added a fresh reaspberry. I used a fresh key lime and needed an extra tablespoon to give me a real lime flavor. I bet theses would be great with lemon juice as well. Thank you. New favorite for sure
I love your adaptations! Can’t wait to give them a try. Thank you for sharing!
Can the filling be made the night before and then filled the next day before you serve?
YOu bake the little pyllo cups first, right?
Mine came ready to use so there was no need to bake. I would just double check the directions on the back of the box.
So Key Lime is different from a lime? Are they at the grocery store? or do I have to go to a specialty store? Sounds yummy!
Key limes are much smaller and a little sweeter vs persian (the ones you typically find in the store) but I’ve made this recipe with both varieties and have gotten rave reviews from both. Sometimes you can find key lime juice in the juice aisle of regular grocery stores but if not swap for the regular limes.
Recipe calls for 30 cups so 30 servings
Thanks for responding for me! Always appreciate the extra help.
How many little cups does this recipe make?
30 bite sized phyllo dough cups. I’ll update the recipe to show the servings.
Thank you thank you thank you!!! Not only is this remarkably easy and super delicious, it is also egg free!! This is a true blessing for those of us with egg allergies who want yummy desserts!