Decadent Caramel Mud Cake Recipe with Gluten Free Option

Rich, dark caramel mud cake made using real caramel sauce from scratch. This is every caramel lover’s dream cake — includes a gluten free caramel mud cake option.

This caramel mud cake recipe has been thoroughly tested and refined. A casual idea to use real caramel turned into many hours of testing, and the result is a moist, dense cake with an intense, genuine caramel flavour.

Many so-called “caramel” mud cakes rely on white chocolate plus brown sugar or golden syrup and taste more like butterscotch. This recipe starts by making a real caramel sauce, which becomes the flavour base for the whole cake, delivering a true caramel character that’s rich and deep.

You can finish the cake however you like, but below you’ll find instructions for a caramel Swiss meringue buttercream and a caramel drip to create an indulgent, professional-looking finish.

Scroll to the recipe card for a printable ingredients list and full instructions, or keep reading for tips and photos of the process.

Ingredients

Here’s what you’ll need to make this caramel mud cake:

• Cream – Use whipping cream, single cream or heavy cream depending on what’s available in your region. Warm the cream slightly before adding to hot caramel.
• Sugar – Caster (superfine) sugar dissolves fastest, but regular granulated sugar will work if that’s what you have.
• Corn syrup or liquid glucose – Optional, helps reduce the risk of sugar recrystallisation in the caramel. If you don’t have it, you can omit it.
• Salt – A flaky sea salt balances the sweetness. Reduce slightly if using table salt.
• Vanilla extract – Adds depth to the caramel. Vanilla paste is also fine.
• Milk – Full fat (whole) milk gives the best texture.
• Unsalted butter – If you use salted butter, reduce added salt accordingly.
• White chocolate – Adds structure and a smooth texture; it’s more for texture than a dominant white-chocolate flavour.
• All-purpose flour or gluten free flour blend – Use a good-quality gluten free all-purpose blend if you need a GF cake; see notes about xanthan gum below.
• Xanthan gum – Only if making the gluten free version and your flour blend doesn’t already include a gum.
• Baking powder – If using gluten free ingredients, check your baking powder is gluten free.
• Eggs – Large eggs, at room temperature.

To make the caramel Swiss meringue buttercream for icing and decorating, you will also need egg whites, additional caster sugar, more vanilla and unsalted butter, plus lightly salted caramel sauce to flavour the buttercream and to use as a drip.

How to Make Caramel Mud Cake

The process begins by making a proper caramel sauce. Combine the sugar, water and corn syrup in a saucepan and bring to the boil. Cook until the syrup develops a deep amber colour — if you use a candy thermometer this is around 160°C (320°F).

Remove from the heat and carefully whisk in warmed cream (it will splutter and steam). Return to the heat and simmer gently until smooth and around 115°C (240°F) on the thermometer. If you don’t have a thermometer, cook until the caramel darkens a little more and smells richly caramelised — but stop immediately if you detect any burning smell.

Heat milk and melt the butter into it, then slowly whisk the caramel into this warm milk-butter mixture. Adding cold ingredients directly to hot caramel risks splitting; warming the milk and butter first avoids that problem.

Stir in chopped white chocolate until melted, then allow the mixture to cool until it’s no longer hot to the touch. Sift the dry ingredients and fold them into the cooled liquid in 2–3 additions using a gentle folding motion to avoid incorporating too much air. Mix in the beaten eggs, pour into prepared pans and bake.

Bake at a low temperature until a skewer comes out clean or with just a few crumbs. Mud cakes are dense and can crack slightly on top; trimming a small crust off the top when leveling removes any cracks.

Caramel Mud Cake Tips

Making the Caramel

Using real caramel sauce is what makes this cake stand out. If you’ve never made caramel, the best way to overcome the fear is to prepare carefully, read the steps through, have everything measured and at hand, and give it a go. A candy thermometer helps but isn’t essential.

Baking Strips and Foil Lid

This recipe performs best baked without baking strips or a foil lid. A foil lid steams the cake and produces a more pudding-like texture; for a cakey, dense and fudgy mud cake, bake without a lid. If the top browns too much before the centre is done, loosely cover the top with foil for the remaining bake time.

Carving

The cake is sturdy enough for decorating and carving. If your gluten free version feels a little soft for carving, chill it briefly to firm it up. For carved cakes, ganache is often a more stable filling and crumb coat than buttercream.

Storing

Store the cake in an airtight container or sealed with frosting or fondant; it will keep well at cool room temperature for at least a week. For longer storage, wrap well and freeze before decorating.

How to Decorate the Cake

I flavoured Swiss meringue buttercream with lightly salted caramel and used the same caramel for a drip. Split each cake into layers, fill and crumb coat with buttercream, chill until firm, then pipe swirls and stars around the top and add a caramel drip for extra indulgence.

Recommended piping tips include large star and open star tips for varied textures (for example, Wilton 1M and 6B or similar), plus smaller tips to fill gaps. Use couplers so you can swap tips without changing bags.

Caramel Drip Tips

Caramel drips more slowly than ganache. Chill the cake, and warm the caramel just until pourable — not too runny. Test the consistency on the side of a glass. It’s best to add the drip on the day you plan to serve the cake, as caramel can continue to flow and may leave puddles if left too long.

If you like, spoon extra caramel over individual slices when serving — extra caramel is always welcome.

More Recipes You May Like

• Gluten Free Chocolate Mud Cake — a rich dark chocolate mud cake suitable for carved cake designs.
• Gluten Free White Chocolate Mud Cake — a fudgy cake with white chocolate flavour.
• Gluten Free Fruit Cake — a classic gluten free Christmas cake.

Recipe: Rich Caramel Mud Cake

Makes: Two 7″ round, 2″ high cakes (about 12 pieces)

Prep time: 30 minutes | Cook time: 1 hour 30 minutes | Total time: 2 hours

Ingredients

• 125 ml whipping cream (or heavy cream)
• 400 g sugar (caster sugar preferred)
• 3 tbsp corn syrup or liquid glucose (optional)
• 125 ml water
• 1 ½ tsp salt
• 1 tsp vanilla extract
• 375 ml full fat milk
• 350 g unsalted butter
• 180 g white chocolate, chopped
• 375 g all-purpose flour or gluten free flour blend
• 2 tsp baking powder
• ½ tsp xanthan gum (only if making gluten free and your blend needs it)
• 3 large eggs

Instructions

1. Line the base and sides of two 7″ round cake pans (at least 3″ high).
2. Warm the cream slightly and set aside to reduce splattering when added to the hot caramel.
3. In a medium saucepan combine the sugar, water and corn syrup and stir until moistened. Bring to a simmer, brushing down any sugar crystals on the sides with a pastry brush dipped in water.
4. Increase heat and boil until the syrup turns a light amber colour (about 160°C/320°F on a thermometer). Remove from heat.
5. Carefully pour in the warm cream while stirring — expect spluttering and steam. Return to medium heat and gently boil until smooth and about 115°C (240°F). Stir in the salt and vanilla and set aside.
6. In a separate saucepan heat the milk and butter over medium heat until the butter melts.
7. Slowly whisk the caramel into the warm milk and butter, then add the chopped white chocolate and whisk until melted and combined. Allow to cool until lukewarm.
8. Preheat the oven to 150°C (300°F). Sift the flour and baking powder (and xanthan gum if using) together.
9. Add the dry ingredients to the cooled liquid in 2–3 additions, folding gently. Whisk the eggs lightly and incorporate them into the batter.
10. Divide the batter between the prepared pans. Tap the pans on the bench to release large air bubbles. Bake 75–90 minutes or until a skewer inserted into the centre comes out clean or with just a few crumbs. The centre should read at least 99°C on an instant-read thermometer if available.
11. Cool the cakes in the pans for 30 minutes, then cover the tops with foil and leave in the pans overnight to cool and firm up before removing and decorating.

Notes

Gluten Free: Use an all-purpose gluten free flour blend. If your purchased blend already contains a gum (xanthan or guar), omit the extra xanthan gum in the ingredients.

If the cakes brown too much before the middle is baked, loosely cover the tops with foil for the remaining bake time. Store finished cakes in an airtight container or once sealed with frosting; they will keep well for at least a week at cool room temperature. For longer storage, wrap and freeze before decorating.

Caramel Swiss Meringue Buttercream (for decorating)

Makes: About 1 kg buttercream

Ingredients

• 210 g egg whites (about 7 egg whites or pasteurised egg whites)
• 325 g sugar (caster or granulated)
• Pinch of salt
• 450 g unsalted butter, softened
• 1 tbsp vanilla extract
• ¾ cup lightly salted caramel sauce, plus extra to decorate

Instructions

1. Ensure the whisk and mixing bowl are thoroughly clean and grease-free.
2. Combine egg whites and sugar in the bowl and place over a pot of gently simmering water. Stir constantly until the sugar dissolves and the mixture reaches 71°C (160°F).
3. Whip the mixture on medium speed for one minute, then increase to medium-high and whisk until stiff and glossy and the bowl is cool to the touch.
4. Switch to the paddle attachment, and with the mixer on low add the butter a piece at a time until fully incorporated. If it looks curdled, keep mixing on low speed — it should come together into a smooth buttercream.
5. Warm the caramel gently until just pourable (not hot) and add to the buttercream with the vanilla. Beat to combine and taste; add more caramel if desired.
6. Split your cooled cakes into layers, fill and cover with buttercream, then pipe decorations and add a caramel drip as desired.

Buttercream Troubleshooting

If the buttercream splits or takes a long time to come together, chill the bowl briefly if it feels warm, or warm it gently over simmering water if it feels too cold. If the buttercream is too soft, refrigerate briefly and re-whip until spreadable.

Happy baking!

Natalie
xx