Lemon Blueberry Shortbread Mousse Cake

This Lemon Blueberry Shortbread Mousse Cake is to die for and perfect for spring and summer! It’s incredibly light and almost completely no bake! With layers of lemon and blueberry mousse, white chocolate ganache and a Walkers Shortbread crust, the only thing that requires a few minutes in the oven is the crust!

This post is sponsored by Walkers Shortbread, but all opinions are my own.

Lemon Blueberry Mousse Cake on a white cake stand

Lemon Blueberry Mousse Cake slice on blue plate

I don’t know about where you are, but here in Atlanta it’s finally getting warm and everything is starting to bloom. We have a hill behind our house that is mostly covered in bushes and we know it’s spring when this particular kind of bush blooms. They always bloom first and for only a couple days. It’s really sad it lasts so little because they’re pink and pretty. 🙂 But they do signal that the warm weather is here! Yay!

I love the bright, vibrant flowers and all the fresh fruit. Everything just comes alive! I feel like this cake is the perfect way to kick off spring. It’s fruity, bright and cheerful. Plus, it’s seriously delicious.

There’s a layer of lemon and blueberry mousse on top. Both are simple to make and oh so light. They sit atop a layer of white chocolate ganache that rests on top of a wonderful, buttery shortbread crust.

The layer of ganache and shortbread crust is one of the best parts of this cake! Seriously, if you’ve never tried Walkers Shortbread you really must. They are SO buttery and delicious, they basically melt in your mouth. I can’t stop eating them. And unlike a lot of things, they contain no artificial flavorings, colorings or additives. The ingredients on the box are literally four things – flour, butter, sugar and salt. They’re the jam. They even have several gluten free flavors.

Lemon Blueberry Mousse Cake overhead view
Lemon Blueberry Mousse Cake on a cake stand with a slice on a plate in front

The crust is a mixture of the shortbread crumbs, a little sugar and little butter. It’s less butter than I normally add to crusts because there’s already so much buttery-ness in the cookies. The crust is baked and then topped with white chocolate ganache with a bit of lemon zest in it. Amazing.

Layered on top of that is the lemon and blueberry mousse. The lemon mousse is made with lemon curd and some gelatin and whipped cream. The blueberry mousse uses blueberry puree that is strained, thickened with gelatin, then added to whipped cream. Both mousse layers are incredibly light in texture. The flavors are also light, but just enough.

Everything comes together beautifully. Such refreshing flavors complimented with the buttery crust for a light crunch. Pure heaven and your new favorite dessert. 😉

Lemon Blueberry Mousse Cake on a cake stand
Lemon Blueberry Mousse Cake slice on a blue plate

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Slice of Lemon Blueberry Mousse cake on a blue plate
Recipe

Lemon Blueberry Shortbread Mousse Cake

  • Yield: 12-14 Slices
  • Category: Dessert
  • Method: Oven
  • Cuisine: American

Description

A light cake with layers of lemon and blueberry mousse, white chocolate ganache and a buttery shortbread crust.


Ingredients

CRUST

  • 1 3/4 cups Walkers shortbread crumbs (two 5.3 oz packages, about 15 cookies)
  • 2 tbsp sugar
  • 2 tbsp (28g) butter, melted

FUDGE

  • 8 ounces (227g) white chocolate chips
  • 3 tbsp (42g) unsalted butter
  • 3 1/2 tbsp (53ml) heavy whipping cream
  • 2 tsp lemon zest

LEMON CURD

  • 1/4 cup (60ml) fresh lemon juice (12 lemons)
  • 2 tsp finely grated lemon zest
  • 1/3 cup (69g) sugar
  • 4 egg yolks
  • 3 tbsp (42g) unsalted butter

LEMON MOUSSE

  • 2 tsp powdered gelatin
  • 2 tbsp (30ml) cold water
  • 1 3/4 cups (420ml) heavy whipping cream
  • 3/4 cup (86g) powdered sugar
  • 3/4 cup (180ml) lemon curd

BLUEBERRY MOUSSE

  • 1 1/2 cups (8 oz) blueberries
  • .25 oz package unflavored powdered gelatin
  • 1 3/4 cups (420ml) heavy whipping cream
  • 3/4 cup (86g) powdered sugar

Instructions

1. Preheat oven to 350 degrees. I would suggest lining the sides of a 9 inch springform pan with parchment paper that goes about one inch above the sides of the pan. The mousse will come all the way to the top and just a touch above. The parchment paper ensure that the pan sides will be tall enough. It’ll also make it easier to remove the cake from the pan at the end.
2. To make the crust, combine the crust ingredients in a medium sized bowl, then press into the bottom of the springform pan.
3. Bake the crust for 10 minutes, then remove from oven and set aside.
4. To make the white chocolate ganache layer, place the white chocolate chips in a medium sized bowl. Heat the butter, heavy whipped cream and lemon zest in a glass measuring cup. The butter should melt and then the whole mixture should come to a boil. Once boiling, pour the heavy cream mixture over the white chocolate chips, then cover for about 5 minutes.
5. Whisk the white chocolate mixture until smooth. If it doesn’t completely melt, microwave in 10 second increments, whisking in between, until smooth.
6. Spread white chocolate ganache evenly over the crust, then refrigerate until firm.
7. To make the lemon curd, combine all ingredients in a double boiler (or in a metal bowl over a pot of simmering water, like I did). Heat while stirring constantly with a whisk until mixture reaches 160 degrees. Refrigerate until thick and cool.
8. Once lemon curd is cooled and firm, finish the lemon mousse. Sprinkle the powdered gelatin over the cold water in a small bowl. Allow to sit for about 5 minutes, then heat for about 5-10 seconds, whisking until warm and smooth. Set aside to cool to room temperature.
9. In another mixer bowl, whip heavy whipping cream on high until it begins to thicken. Add powdered sugar and continue to whip on high until stiff peaks form, while slowly pouring in the cooled gelatin.
10. Carefully fold the lemon curd into the whipped cream, then spread the lemon mousse evenly over the white chocolate ganache.
11. To make the blueberry mousse, puree blueberries then press through a strainer to remove pulp.
12. Sprinkle the powdered gelatin over the blueberry puree, trying to make sure the powder is all touching the puree. Set aside for about 5 minutes to bloom and firm up.
13. Once gelatin is firm, heat in the microwave for 5-10 seconds, then whisk until melted and smooth. Set aside to cool to room temperature.
14. While gelatin mixture cools, make the whipped cream. Whip heavy whipping cream on high until it begins to thicken. Add powdered sugar and continue to whip on high until stiff peaks form.
15. Once the gelatin is room temperature, fold it into the whipped cream until well combined.
16. Spread the blueberry mousse in an even layer over the lemon mousse layer, then place in the refrigerator.
17. Refrigerate cake until firm, 5-6 hours, then remove from springform pan and place on a serving plate. Top cake with blueberries and lemon slices/zest.
18. Refrigerate until ready to serve.


Nutrition

  • Serving Size: 1 Slice
  • Calories: 540
  • Sugar: 33.1 g
  • Sodium: 123.7 mg
  • Fat: 39.7 g
  • Carbohydrates: 42.8 g
  • Protein: 5.5 g
  • Cholesterol: 146.8 mg

Enjoy!

 

Recipe inspired by the Triple Chocolate Mousse Cake in this cookbook, Bonjour, Ya’ll.

Lemon Blueberry Mousse Cake - This cake is almost entirely no bake and perfect for spring and summer! A layer of blueberry and lemon mousse on top of white chocolate ganache and a Walkers Shortbread crust!

This post may contain affiliate sales links. Please read my disclosure policy.

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Recipe rating

46 Comments
  1. Sherry Santiago

    I have been a baker for over 30 years and when I made this recipe for Father’s Day my mother stated it was the best cake I have ever made and has requested I make it again for a luncheon we are having tomorrow. Thank you for this easy to follow delicious recipe.

  2. Michelle

    Lindsay,
    Brand new baker here and this recipe has literally convinced my roommates that I am a baking god!! Super clear and easy to follow steps even for a newbie like me. Over the moon with how this turned out!! Totally agree with Debbie about the gelatin, that tricky smelly guy haha Really excited to try some of your other recipes 🙂

  3. Amanda

    Hi, this cake looks delicious but I have a question about the amount of blueberries-it says 1 and 1/2 cups is equal to 8oz but it’s actually equal to 12oz as one cup is 8oz.

    1. Lindsay

      So one cup is equal to 8oz when you’re talking about liquids and volume. It’s a little different for solids and weight. All things weigh differently because some are just heavier than others. In this case, 1 1/2 cups of blueberries is about 8 oz by weight, not volume. Does that help?

  4. Debbie

    Lindsay, OMG!! I made this mousse cake and the flavor combinations were amazing. However this was my first mousse cake and working with gelatin so I had some issues. I think  my biggest issue definitely was with the gelatin. Please do a video tutorial on knowledge with mousse and gelatin. I watched a couple and neither gave me much insight. The videos really only cover how to turn it in to a solid and how to liquify. For those of us that has never dealt with building a mousse cake are shocked when it goes wrong because we fill as thought we followed the recipe to a T.  After blooming and heating my gelatin at 10 seconds in the microwave and stirring to make sure all granules were well liquified I left it to cool while preparing next step which was whipping my cream. Fir the lemon curd when I went to put the gelatin in with the curd it started out smooth and liquid but before I could spoon out the rest, it had solidified. I honest just reached in and grabbed the solid gelatin and  discarded., praying I had enough in the lemon mousse to set. When I went to put my  blueberry gelatin and folded it in carefully, all looked well. I did freeze the mousse cake because I wanted to do a mirror glaze. I smoothed and put it in the freezer. My cake looked just as pictured  when I pulled it out to  complete the mirror glaze.  When we cut the cake I used the tips you provided with a warm knife. It cut perfect cake pieces.   My thoughts of excitement to put a piece of this mousse cake in my mouth grew times a million . When I had my third bite  not  so great, I had a couple small pieces of gelatin in my blueberry mousse ? hmm What did I do wrong? ???What do I do when my gelatin is solidified when also  putting in to the cream… …. do I stop, reheat and  try again or do I discard and start over? Please HELP!! I would hate the thoughts of never being able to master this amazing cake. Please do a video for this and demonstrate to beginners what could go wrong and how to master it. I would so appreciate it. Btw, I love every recipe I have made of yours . Each one has been absolutely awesome!! Even with my hard bits of gelatin, I gave  this 5 stars!  😋Thank you  so much!! 

    1. Lindsay

      Thank you for the feedback Debbie! Gelatin can definitely be a little tricky. I’d love to do more of a tutorial for working on it and will! Thanks!

  5. Rosa

    Greetings! I’m so not savvy in the kitchen. Basically, if I don’t see a video, I know I’ll mess up the steps. Just curious: can I skip the lemon curd making process (which sounds the most daunting to me) and buy it already made and then mix it to make the lemon mousse layer? Thanks!! 

    1. Lindsay

      I promise lemon curd isn’t as hard as it seems. 🙂 I would suggest using the curd listed in the recipe, just because store bought is often a different thickness and you want it to be thick enough to stand up in the mousse. Feel free to check out my recent post on Lemon Curd for some tips.

Lindsay
About Lindsay

I'm a wife and mom to twin boys, a baby girl and a sweet black lab with a serious sweets addiction! Bring on the sugar!

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“Be joyful in hope, patient in affliction, faithful in prayer.” Romans 12:12