This chocolate filling for cake is a thick, glossy ganache style filling made with 200 g (7 oz) of chopped semi sweet or dark chocolate, 200 ml of heavy cream, 2 tablespoons of butter, vanilla, and a pinch of salt. It takes about 15 minutes of work plus 45 to 60 minutes of cooling, and it fills a two layer 8 inch cake generously.
It needs no whipping, gelatin, or starch. The chocolate sets the filling on its own as it cools, and the butter keeps it soft and spreadable instead of fudgy. The trick is patience: let it thicken slowly and stir it every 10 minutes in the fridge.
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- Fills: one two layer 8 inch cake generously
- Ratio: about equal weights chocolate and cream, plus 30 g butter
- Chocolate: semi sweet or 70% dark, chopped from a bar
- Cream: heavy cream with at least 35% fat
- Time: 15 minutes active, then 15 to 20 minutes on the counter and 30 to 40 in the fridge
- Make ahead: 3 days in the fridge, 1 month in the freezer
Chocolate Ganache Cake Filling: Which Ratio to Use
Ganache is just chocolate and cream, and the ratio decides the texture. Equal weights of chocolate and cream give a soft, spreadable ganache, which is the base of this filling. The 30 g of butter adds shine and keeps it creamy after chilling, so it spreads easily between layers and still holds its shape.
A 2:1 ganache, with twice as much chocolate as cream by weight, sets much firmer. It is used for truffles, sharp edged cake coatings, and fillings that need to be sliced very cleanly. If you want this filling a little firmer for piping or sandwich cookies, you do not need to change the ratio: chill it longer, or use a higher cocoa percentage chocolate. A thinner ratio with more cream than chocolate stays pourable and is better as a glaze or drip.
The Ingredients
Chocolate is the base, so use a good bar. I prefer semi sweet or 70% dark, chopped finely so it melts evenly. Chocolate chips contain stabilizers to hold their shape and can leave the filling slightly waxy. Heavy cream with at least 35% fat is needed for the filling to set. Lighter cream or milk keeps it runny.
Unsalted butter at room temperature adds gloss and a softer texture once chilled. A teaspoon of vanilla keeps the flavor from tasting one note, and a pinch of salt makes the chocolate taste deeper. Powdered sugar is optional. I add 2 tablespoons if the chocolate is quite bitter or the cake is very plain.
How to Make Chocolate Cake Filling
Heat the cream until small bubbles form around the edge, then take it off the heat. Do not let it boil, or the filling is more likely to split. Pour it over the chopped chocolate and leave it alone for 2 full minutes. Then stir slowly in small circles from the center outward until it turns glossy and completely smooth.
Stir in the butter, vanilla, salt, and powdered sugar if using. It will look like a thick sauce. Let it cool on the counter for 15 to 20 minutes so it starts to firm evenly, then refrigerate it for 30 to 40 minutes, stirring every 10 minutes. It is ready when it holds its shape on a spoon but is still soft enough to spread. In a warm kitchen it may need longer; on cool days, less.
If It Goes Wrong
- Split or oily: the cream was too hot or it was stirred too hard. Whisk in 1 tablespoon of warm cream slowly until it comes back together.
- Lumps of chocolate: the chocolate was chopped too coarsely. Set the bowl over warm water for a minute and stir gently.
- Too runny: it needs more chilling, or the cream was too light. Keep chilling and stirring.
- Too firm: it chilled too long. Leave it at room temperature for about 30 minutes and stir until smooth.
- Grainy edges: it was not stirred while chilling. Stir every 10 minutes.
Filling and Stacking a Layer Cake
Level the cake layers, spread the filling about ½ inch thick, and press the next layer on gently. Chill the filled cake for 15 minutes before frosting so the layers do not slide. For a chocolate on chocolate cake, use it inside a sour cream chocolate cake and frost it with dark chocolate buttercream. It is just as good in a moist vanilla cake.
Best Fillings for Chocolate Cake
This ganache filling is the classic, but chocolate cake pairs with plenty of fillings. For fruit, spread a thin layer of raspberry cake filling under the chocolate. For something lighter, try chocolate mousse filling. For nutty flavor, use chocolate hazelnut cake filling, and for a coffee note, espresso cake filling. A caramel layer from my easy caramel cake filling is wonderful with dark chocolate.
If you want a whipped, frosting style texture, see whipped chocolate frosting or chocolate ganache frosting. For a birthday cake twist I have paired this filling with German chocolate frosting, and it was a hit.
Make Ahead and Freezing
Make the filling up to 3 days ahead and keep it in an airtight container in the fridge. Before using, leave it at room temperature for about 30 minutes and stir until smooth. Do not reheat it directly. It also freezes in a zip bag for up to 1 month. Thaw it overnight in the fridge and stir before using.
Chocolate Filling FAQ
What is the best chocolate filling for cake?
A ganache filling made with good chocolate, heavy cream, and a little butter. It is rich, spreadable, and stays put between layers.
Can I use chocolate chips?
You can, but a chopped bar melts more smoothly. Chips can leave the filling slightly waxy.
How long does it take to set?
About 15 to 20 minutes on the counter, then 30 to 40 minutes in the fridge, stirring every 10 minutes.
Can I pipe this filling or use it for macarons?
Yes. Chill it a little longer until it holds its shape, or use a higher cocoa percentage chocolate for a firmer set.
Does a cake with chocolate ganache filling need to be refrigerated?
Store the finished cake in the fridge, and let slices sit out briefly before serving so the filling softens.
Pin this chocolate cake filling for your next birthday cake, cupcakes, or sandwich cookies. If you try it, leave a comment and tell me which cake you filled, or share a variation you love.
Chocolate Cake Filling Recipe
This chocolate cake filling is a rich, ganache style chocolate filling for cake made with chopped semi sweet or dark chocolate, heavy cream, butter, vanilla, and a pinch of salt. It takes about 15 minutes plus 45 to 60 minutes of cooling and fills a two layer 8 inch cake generously with a thick, glossy, spreadable layer. Equal weights of chocolate and cream plus a little butter let it set on its own, with no gelatin or starch. Use it between chocolate or vanilla cake layers, in cupcakes, sandwich cookies, or macarons, or pair it with raspberry or caramel fillings. Make it 3 days ahead in the fridge or freeze it for 1 month.
Ingredients
- 200g (7 oz) semi-sweet or dark chocolate, chopped
- 200ml (3/4 cup + 1 tbsp) heavy cream
- 30g (2 tbsp) unsalted butter, room temperature
- 2 tbsp powdered sugar (optional, for sweetness)
- 1 tsp vanilla extract
- Pinch of salt
Instructions
- HEAT THE CREAM: In a small saucepan, heat the heavy cream over medium heat until it just begins to simmer. Watch closely and remove from heat as soon as you see small bubbles forming around the edges. Do not let it boil.
- POUR OVER CHOCOLATE: Place the chopped chocolate in a heatproof bowl. Immediately pour the hot cream over the chocolate, making sure it is fully covered. Let it sit undisturbed for 2 minutes to allow the chocolate to soften.
- STIR UNTIL SMOOTH: After the resting time, begin stirring gently in small circles from the center outward. Continue stirring until the mixture becomes glossy and fully smooth with no remaining lumps of chocolate.
- ADD BUTTER AND FLAVOR: Stir in the room temperature butter, vanilla extract, and a pinch of salt. If a sweeter filling is preferred, add the powdered sugar at this stage. Mix until everything is completely blended and the filling is shiny.
- CHILL TO THICKEN: Let the filling cool at room temperature for 15–20 minutes, then transfer it to the refrigerator. Chill for 30–40 minutes, stirring every 10 minutes to maintain a smooth texture, until it reaches a spreadable consistency suitable for layering in cakes.
Notes
Use a chopped chocolate bar and heavy cream with at least 35% fat. Do not let the cream boil. Stir every 10 minutes while chilling to keep the filling smooth. For a firmer texture for piping or sandwich cookies, chill longer or use a higher cocoa percentage chocolate. Filling can be made up to 3 days in advance and stored in an airtight container in the refrigerator, or frozen for 1 month. Bring to room temperature and stir before using.
Nutrition Information
Yield
12Serving Size
1Amount Per Serving Calories 128Total Fat 8.2gSaturated Fat 5.0gUnsaturated Fat 3.3gCholesterol 9.4mgSodium 4.9mgCarbohydrates 13gFiber 1.2gSugar 10gProtein 0.9g
