This white chocolate ganache is a thick, glossy cake ganache made with just 12 ounces of finely chopped white chocolate, ½ cup of heavy cream, vanilla, and a pinch of salt. It takes about 10 minutes to make and roughly an hour to cool, and one batch fills and frosts an 8 inch layer cake.
The key is the ratio. At close to 3 parts white chocolate to 1 part cream by weight, it sets firm enough to hold between cake layers or cover the outside of a cake, but stays soft on the fork. The same batch changes jobs as it cools: slightly warm for drips, cooled for spreading and filling, lightly chilled for piping.
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- Ratio: 12 oz (340 g) white chocolate to ½ cup (120 ml) heavy cream, about 3:1 by weight
- Yield: enough to fill and frost one 8 inch layer cake
- Time: 10 minutes hands on, about 1 hour cooling to a spreadable texture
- Cream: heavy cream with 30 to 35% fat, heated to a gentle simmer, never boiled
- Uses: cake filling, covering a cake, drip cakes, cupcake frosting, piping
- Storage: covered in the fridge for up to 1 week; soften at room temperature and stir before using
White Chocolate Ganache for Covering a Cake (3:1 Ratio, Drip vs Spread)
Many people look for white chocolate ganache for covering a cake rather than only filling it, and this ratio does both. White chocolate has more cocoa butter and milk solids and less cocoa mass than dark chocolate, so it needs much less cream to set. A 1:1 dark chocolate ganache ratio would stay runny with white chocolate. At 3:1 it sets like soft fudge.
How you use it depends on its temperature:
- Drip: use it slightly warm, when it is still fluid but no longer hot to the touch. Chill the frosted cake first, then test one drip on the side. If it runs to the board, wait a few minutes; if it stops too high, warm the ganache for a few seconds.
- Spread to cover a cake: let it cool at room temperature until it is thick and holds a soft swirl, usually close to an hour. Apply a thin crumb coat, chill the cake for 15 to 20 minutes, then add the final layer with an offset spatula and a bench scraper.
- Pipe: chill it briefly and stir every few minutes until it holds a ridge, then pipe borders or rosettes on cupcakes.
For a darker cake coating, my chocolate ganache frosting and the classic chocolate ganache recipe use the same method with dark chocolate ratios. For a festive drip cake idea, see these mini Christmas drip cakes.
Why It Works as a Layer Cake Filling
A good ganache filling for layer cakes needs to do more than taste rich. It has to spread cleanly, stay in place once the cake is stacked, and still feel soft enough that it does not eat like a slab of candy. This one sits between whipped cream and dense frosting: more stable than a whipped filling, gentler than a thick buttercream.
If you like light fillings such as vanilla mousse cake filling, this takes the same cake in a richer, silkier direction. It also pairs well next to a fruit layer like raspberry cake filling or berry cake filling, where the sweet, creamy white chocolate balances the tart fruit.
Choosing the Right White Chocolate
With only four ingredients, the white chocolate decides the result. Use a good quality bar or couverture that lists cocoa butter near the top of the ingredients, and chop it finely so it melts evenly. Baking chips contain stabilizers that help them keep their shape in cookies, which can make the ganache thicker or uneven. Candy melts are not white chocolate and will not set the same way.
Heavy cream with 30 to 35% fat melts the chocolate into a smooth emulsion. Vanilla softens the sweetness, and a pinch of salt stops white chocolate ganache from tasting flat or sugary.
How to Make It Smooth and Glossy
Put the finely chopped chocolate in a clean, heatproof bowl. Warm the cream in a small saucepan over medium heat until small bubbles form around the edge, but do not let it boil. White chocolate scorches and turns grainy at a much lower temperature than dark chocolate, so gentle heat matters.
Pour the hot cream over the chocolate and leave it alone for 2 to 3 minutes. Then stir slowly from the center outward until the ganache is glossy and completely smooth. Stir in the vanilla and salt. Do not whisk hard; you want a silky ganache, not an airy one.
It will look loose right after mixing. That is normal. Let it cool at room temperature until it reaches the texture you need. If it is still runny for filling, it needs more time rather than more chocolate.
Grainy, Oily, or Too Runny? How to Rescue It
- Grainy or lumpy: the chocolate did not melt evenly or got too hot. Set the bowl over barely warm water and stir gently until smooth.
- Oily or split: the cream was too hot or the ganache was overworked. Stir in a tablespoon of warm cream slowly from the center until it comes back together.
- Too runny for filling: it needs more cooling time. Chill it briefly and stir every few minutes.
- Too firm to spread: it has cooled past the easy stage. Let it sit at room temperature, or warm it for a few seconds, and stir.
- Ganache slides out of the layers: pipe a buttercream dam around the edge of each layer before adding the filling, then chill the stacked cake.
Cakes That Pair Best
This ganache shines with cakes that let the white chocolate stay noticeable. Vanilla, white, almond, and soft yellow cakes are natural fits, and a sturdy crumb like my moist vanilla cake supports the filling without squeezing it out. For an all white celebration cake, layer it into a white chocolate cake or a white chocolate coconut cake.
It also works in chocolate cakes when you want contrast rather than more cocoa. A dark chocolate sponge with a white chocolate ganache middle, or one layer of ganache next to a chocolate cake filling, gives a clean, sweet finish. If you prefer a whipped frosting on the outside, white chocolate frosting is the lighter match.
Readers Often Wonder
What is the ratio for white chocolate ganache?
For filling and covering a cake, use about 3 parts white chocolate to 1 part heavy cream by weight: 12 oz (340 g) chocolate to ½ cup (120 ml) cream.
Can I use white chocolate ganache to cover a whole cake?
Yes. Let it cool until thick and spreadable, apply a thin crumb coat, chill the cake, then spread the final coat. One batch fills and frosts an 8 inch layer cake.
How long does white chocolate ganache take to set?
It usually reaches a spreadable texture after about an hour at room temperature, and it firms more in the fridge.
Why is my white chocolate ganache not thickening?
Either it needs more cooling time, or the ratio has too much cream. At 3:1 it will thicken as it cools; chill it briefly if your kitchen is warm.
Can I use white chocolate chips?
You can, but chips contain stabilizers, so the ganache may be thicker or less smooth. Chopped bars or couverture give the best result.
Does a cake with white chocolate ganache need to be refrigerated?
Yes, because the ganache contains cream. Store the cake covered in the fridge and let slices sit out for a little while before serving.
Save this white chocolate ganache to your cake decorating board for your next layer cake or drip cake, and tell me in the comments which cake you paired it with.
White Chocolate Ganache Filling Recipe
This white chocolate ganache is a smooth, glossy cake ganache made with white chocolate, heavy cream, vanilla, and a pinch of salt. It takes about 10 minutes to make, sets to a spreadable texture in roughly an hour, and fills and frosts one 8 inch layer cake. A ratio of about 3 parts white chocolate to 1 part cream by weight lets it thicken enough to hold between layers without turning hard. Use it slightly warm as a drip, cooled as a white chocolate filling for cake, spread as white chocolate ganache for covering a cake, or lightly chilled for piping cupcakes. It pairs well with vanilla, almond, raspberry, or chocolate cakes. Store it covered in the fridge for up to 1 week and stir before using.
Ingredients
- 12 oz (340g) white chocolate, finely chopped
- 1/2 cup (120ml) heavy cream (30–35% fat)
- 1 teaspoon vanilla extract
- Pinch of salt
Instructions
CHOP THE CHOCOLATE: Place finely chopped white chocolate into a clean heatproof bowl so it melts evenly and smoothly when combined with the cream.
HEAT THE CREAM: Pour heavy cream into a small saucepan and warm over medium heat until it begins to simmer with small bubbles forming around the edges, making sure it does not boil.
POUR AND REST: Carefully pour the hot cream over the chopped white chocolate and let the mixture sit undisturbed for 2 to 3 minutes so the chocolate softens fully.
STIR UNTIL SMOOTH: Using a spatula or whisk, stir slowly from the center outward until the mixture becomes fully combined, smooth, and glossy with no visible lumps.
ADD FLAVOR: Stir in the vanilla extract and a pinch of salt, mixing thoroughly to balance sweetness and enhance flavor.
COOL TO DESIRED CONSISTENCY: Allow the ganache to cool at room temperature until it thickens to your preferred texture, using it slightly warm for drips, cooled and spreadable for filling, or slightly chilled for piping.
Notes
Use high-quality white chocolate for best texture and flavor, as baking chips can create a thicker or uneven result.
Avoid overheating the cream, since excessive heat can cause the ganache to separate or become grainy.
Ganache thickens as it cools, so allow time to reach the right consistency before using: slightly warm for drips, cooled and spreadable for filling or covering a cake, slightly chilled for piping.
If a thicker texture is needed, let it sit longer or refrigerate briefly while stirring occasionally.
Store covered in the fridge for up to 1 week; bring to room temperature and stir until smooth before using.
Nutrition Information
Yield
12Serving Size
1Amount Per Serving Calories 193Total Fat 13gSaturated Fat 7.9gUnsaturated Fat 4.8gCholesterol 18mgSodium 28mgCarbohydrates 17gFiber 0.1gSugar 17gProtein 2.0g
