Peppermint Mocha Swiss Roll

The moment a hot cocoa sponge lands on a sugared towel, it’s flexible enough to roll without fighting you. Wait until it cools, and that same thin cake is far…

By Ava
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November 14, 2026
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Reading time: 11 min

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The moment a hot cocoa sponge lands on a sugared towel, it’s flexible enough to roll without fighting you. Wait until it cools, and that same thin cake is far more likely to crack when you shape it. I roll this peppermint mocha Swiss roll while it’s still hot, then let it cool in its towel so it holds a gentle curve for the filling.

The sponge gets its lift from eggs beaten until thick and pale, not from butter or a heavy batter. That airy texture is what makes it soft enough to roll, while espresso deepens the cocoa flavor without turning the cake into a coffee dessert. A mascarpone-and-cream filling brings the peppermint through the middle, and a smooth semisweet ganache finishes the outside. Each slice shows off the spiral, with a soft cake and a cool, creamy center.

Peppermint Mocha Swiss Roll with glossy chocolate ganache

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Kitchen Note

Keep the towel snug against the cake as you roll, but don’t pull so hard that you compress the sponge. Starting while it’s hot lets the cake take on its rolled shape before it cools.

Save this peppermint mocha Swiss roll for a bake with a soft cocoa sponge, peppermint mascarpone filling, and a glossy chocolate finish.

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Why this cocoa sponge has to be rolled while warm

A Swiss roll isn’t a butter cake that happens to be thin. Its flexible crumb comes from a generous amount of beaten egg, which traps air and gives the cake a light, springy structure. That structure helps the baked sheet bend around the filling instead of breaking into pieces.

Once the cake comes out of the oven, it starts losing flexibility as it cools. Rolling it with a towel inside gives the sponge a curved shape to cool in, so it doesn’t have to make its first tight bend later, when it’s more fragile. The towel also keeps the cake from sticking to itself while it rests. When it’s cool, unroll it gently, spread the filling, and roll it back up without the towel.

The other place this sponge can lose its lift is when the dry mixture goes in. Sifting the cocoa and flour over the egg foam in three additions makes it easier to fold them through without leaving pockets of powder or stirring out all the air. Stop as soon as the last dry streak disappears; a few extra turns of the spatula can leave you with a denser cake that’s harder to roll.

The ingredients that keep the sponge light and the filling steady

Peppermint Mocha Swiss Roll sliced cocoa roll

Eggs — Room-temperature eggs beat more readily into the thick, pale foam this sponge depends on. Check that they’re at room temperature before you start; cold eggs take longer to build volume.
All-purpose flour and unsweetened cocoa — Flour gives the thin cake enough structure to hold together, while cocoa brings the chocolate flavor. Sift both with the other dry ingredients so the cocoa doesn’t leave clumps in the batter. For a gluten-free version, a cup-for-cup gluten-free baking blend can replace the all-purpose flour; the texture may be a little less springy.
Instant espresso powder — It rounds out the cocoa rather than making the cake taste like a cup of coffee. Instant espresso powder is more reliable here than brewed coffee, which would add liquid to the delicate batter and filling.
Mascarpone and heavy cream — Mascarpone gives the filling a mellow, creamy body, and the cream whips it into a spreadable filling. Choose mascarpone that tastes fresh and mild; softened mascarpone beats more smoothly. There isn’t a direct swap that keeps the same gentle flavor and texture.
Peppermint extract — This concentrated extract gives the filling its clear mint note. Use peppermint extract rather than peppermint oil, which is much stronger and isn’t a direct measure-for-measure substitute.
Semisweet chocolate — Finely chopped pieces melt evenly when the hot cream is poured over them. Bittersweet chocolate can stand in by weight if you want a less-sweet, more intense ganache; chocolate chips are less dependable because they may not melt as smoothly.

From egg ribbon to a clean slice: building the roll

Beat the eggs, then fold gently

Heat the oven to 350°F, and prepare a 10×15-inch jelly-roll pan with grease, parchment, and another light coat of grease on the parchment. Whisk the flour, cocoa, one portion of espresso powder, baking powder, and salt together. Beat the eggs with the granulated sugar and vanilla on high for 8–10 minutes, until they’re very thick and pale, and a ribbon falling from the beater holds briefly. Sift in the dry mixture in three additions, folding each one just until no dry streaks remain.

Bake the thin layer and roll it at once

Spread the batter evenly into the prepared pan so it bakes at a consistent thickness. Bake for 10–12 minutes, until the center springs back when you touch it lightly; a cake that still leaves a dent needs more time. While it bakes, dust a clean kitchen towel with confectioners’ sugar. Invert the hot cake onto the towel, peel away the parchment carefully, then roll from a short end with the towel tucked inside.

Whip a coffee-mint filling

Let the rolled cake cool seam-side down for 45–60 minutes before filling it. Stir the remaining espresso powder into the hot water and let that mixture cool. Beat the softened mascarpone with the remaining confectioners’ sugar until smooth, then beat in the espresso mixture and peppermint extract. Add the cream gradually and beat until the filling holds medium-stiff peaks; if it’s still loose, it’ll be more likely to squeeze out when you reroll the cake.

Chill the roll before glazing

Unroll the cooled cake carefully and remove the towel. Spread the filling evenly, leaving a 1/2-inch border, then roll the cake back up without the towel and set it seam-side down on a serving platter. Cover and chill for at least 30 minutes. For the ganache, put the chopped chocolate in a heatproof bowl, heat the remaining cream in a small saucepan until steaming, and pour it over the chocolate; wait 3 minutes before stirring until smooth.

Let the ganache cool for 10–15 minutes, stirring occasionally, until it’s thickened but still pourable. If it’s hot and runny, it will slide off the chilled roll instead of coating it. Pour it over the cake and spread it across the top and sides, then chill for 20–30 minutes until set before slicing.

Three ways to shift the peppermint mocha roll

Make it a straight mocha roll

Leave the peppermint extract out of the filling and keep the espresso and chocolate components. The result leans into mocha, with the mascarpone providing a mellow center instead of a minty one.

Use a gluten-free cake layer

Replace the all-purpose flour with the same amount of a cup-for-cup gluten-free baking blend. Choose a blend intended to replace wheat flour in baking; the sponge may be a touch less elastic, so handle it gently when you unroll and fill it.

Keep the ganache on top

Pour the ganache along the center of the chilled roll and spread it across the top without coating the sides. You’ll get a more visible contrast between the dark chocolate top and the cocoa sponge, and the sides stay easier to portion cleanly.

Make-Ahead and Storage

Refrigerator: Keep the covered roll refrigerated and enjoy it within 3 days. The sponge softens a little as it sits with the filling.
Freezer: I don’t recommend freezing the assembled roll; the mascarpone-and-cream filling can lose its smooth texture as it thaws.
Serving: Serve chilled. Use a sharp knife and wipe it between slices so the ganache doesn’t drag through the filling.

Questions about peppermint mocha Swiss roll

Can I use a hand mixer instead of a stand mixer?+

Yes. Beat the eggs, sugar, and vanilla on high with a hand mixer and use the ribbon cue rather than relying only on the clock. The mixture should look very thick and pale, and the ribbon should hold briefly when it falls from the beaters.

How do I handle a sponge that cracks when I unroll it?+

Small cracks are fine; spread the filling gently and roll the cake back without trying to press the cracks closed. The ganache covers the outside, and the cake will still slice into a spiral. If it breaks into large pieces, avoid forcing it into a tight roll, which can push out the filling.

Can I replace the espresso powder with brewed coffee?+

Brewed coffee isn’t a good one-for-one replacement because it adds liquid to both the cake and filling. If you don’t have instant espresso powder, leave it out; you’ll have less mocha depth, but the sponge and filling won’t get extra moisture.

Can I use baking soda instead of baking powder?+

No, they aren’t interchangeable in this sponge. Baking soda needs an acidic ingredient to activate, and this batter is formulated with baking powder; swapping in soda can leave the cake with poor lift and an off taste.

How do I keep the ganache from sliding off the cake?+

Let the ganache cool until it’s thickened but still pourable, and glaze the roll after it has chilled. If the ganache is still thin and hot, it won’t cling well to the cake; give it a little more time, stirring occasionally, before pouring.