Introduction

Strawberry mousse cake filling is a light, fluffy, and fruity addition that elevates any cake with its delicate sweetness and creamy texture. This luscious filling combines white chocolate and freeze-dried strawberries to create a vibrant and flavorful layer perfect for special occasions or everyday treats.

A three-layer white sponge cake is covered in smooth pink frosting. Between each sponge layer are two fillings: a thick pink cream layer and a glossy red jelly layer below it. The outside pink frosting is smooth and evenly spread. On top of the cake are fresh whole strawberries and small swirls of the same pink frosting, with a small white flower accent. The cake sits on a white plate placed on a cake stand against a white marbled surface background. Photo taken with an iphone --ar 4:5 --v 7

Ingredients

1 cup good quality white chocolate chips (180g)
1 1/3 cups heavy cream or heavy whipping cream, cold (320g), divided
1/2 cup freeze-dried strawberry powder (56g)
1/4 cup powdered sugar (30g)
1 tsp vanilla extract or vanilla bean paste (4g)
Pinch fine salt (less than 1/8 tsp)
Red gel food coloring (optional)

Instructions

Step 1: Combine 1 cup white chocolate chips and 1/3 cup cold heavy cream in a medium heat-proof bowl. Microwave for 45-60 seconds, then let sit for one minute. Stir with a rubber spatula until smooth and fully melted. Alternatively, use a double boiler. Set aside to cool slightly.
Step 2: In a large bowl or stand mixer fitted with a whisk attachment, add 1 cup heavy cream, freeze-dried strawberry powder, powdered sugar, vanilla extract, and a pinch of salt. Add a drop of red gel food coloring if desired for a vibrant color.
Step 3: Whip the strawberry cream on medium-high speed until it holds thick peaks and maintains texture around the bowl edges, about 1-2 minutes.
Step 4: Gently fold half of the whipped strawberry cream into the melted white chocolate mixture using a rubber spatula. Fold carefully to combine without deflating the mixture.
Step 5: Fold in the remaining strawberry cream until fully incorporated but still light and airy.
Step 6: Cover the mousse with plastic wrap and chill in the refrigerator for at least 2 hours to firm up before using to fill your cake.

Tips & Variations

For best results, prepare the mousse a day ahead to allow flavors to meld and texture to firm up.
Use high-quality white chocolate for a richer, smoother mousse.
If freeze-dried strawberry powder is unavailable, crush freeze-dried strawberries finely or use fresh strawberry puree, but reduce cream slightly to maintain filling consistency.
A small drop of red gel food coloring enhances the pink color without affecting flavor.
Be gentle when folding to keep the mousse light and airy, avoiding overmixing that can cause deflation.

Storage

Store the strawberry mousse filling covered in the refrigerator for up to 2 days. Before using, give it a gentle stir to restore texture if needed. This mousse should remain chilled until right before filling the cake to maintain its structure. It is not recommended to freeze as the texture may change upon thawing.

How to Serve

A close-up of a piece of white cake on a gold fork held by a woman's hand, showing three layers: a soft white sponge cake on top and bottom, with a middle layer of smooth pink cream, and a thin bright red jelly layer just below the cream. The background is a white plate with another slice of the same cake blurred out, all on a white marbled surface. The textures of the cake are light and fluffy, the cream is creamy and smooth, and the jelly is glossy and slightly translucent. Photo taken with an iphone --ar 4:5 --v 7

Serve this delicious recipe with your favorite sides.

FAQs

Can I use fresh strawberries instead of freeze-dried powder?

Fresh strawberries can be used but may add more moisture to the mousse. It’s best to reduce the heavy cream slightly when using fresh strawberries or to use a puree with less liquid to maintain the desired consistency.

Can I make this mousse ahead of time?

Yes, making the mousse 1-2 days in advance helps the flavors develop and the texture to set perfectly. Keep it well covered and chilled in the refrigerator until ready to use.