Boston Cream Pie Swiss Roll
The classic Boston cream pie reimagined as an elegant roll — fluffy vanilla sponge spiraled around silky vanilla pastry cream and draped in glossy dark chocolate ganache.
By Hanan · Salt & Hearth
Published July 31, 2026 · Updated August 1, 2026
🍳 Tested in my kitchen
Prep
40 min
Cook
12 min
Total
52 min
Serves
10
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This Boston cream pie Swiss roll takes everything you love about the classic — fluffy vanilla cake, silky pastry cream, glossy chocolate — and spins it into an elegant, sliceable roll. Every swirl reveals a spiral of tender sponge wrapped around luscious vanilla crème pâtissière, all under a draping of dark chocolate ganache.
It's a bit more delicate and fancy than the layered original, but still very doable at home. And even if a crack sneaks in, the ganache covers everything — so there's nothing to fear.
Why you'll love this recipe
- All the flavor of Boston cream pie in an elegant roll
- Silky homemade vanilla pastry cream filling
- A glossy dark chocolate ganache that ties it together
- More impressive than difficult
- Any little crack hides beautifully under the chocolate
Ingredients
Vanilla sponge
- 4 large eggs, room temperature
- 1/2 cup (100g) granulated sugar
- 1 teaspoon vanilla extract
- 3/4 cup (95g) all-purpose flour
- 1 teaspoon baking powder
- 1/4 teaspoon salt
- 2 tablespoons warm milk
Vanilla pastry cream
- 1 1/4 cups (300ml) whole milk
- 3 large egg yolks
- 1/3 cup (67g) granulated sugar
- 2 tablespoons cornstarch
- 1 teaspoon vanilla extract
- 1 tablespoon butter
Chocolate ganache
- 4 oz (115g) dark chocolate (55-65%), chopped
- 1/2 cup (120ml) heavy cream
Ingredient notes & substitutions
- Egg yolks:
- They give the pastry cream its rich, custardy body and golden color. Save the whites for another bake, or an egg-white omelet.
- Cornstarch:
- It thickens the pastry cream to a pipeable, sliceable consistency. Whisk constantly as it cooks so it stays glossy and smooth, not lumpy.
- Whole milk:
- Full-fat milk makes the richest, silkiest crème pâtissière. Heat it until just steaming before tempering into the yolks.
- Dark chocolate:
- Use a good 55-65% dark chocolate for a ganache that's glossy and balanced. Go higher (70%) if you like it more bittersweet.
- Butter:
- A tablespoon stirred into the finished pastry cream adds shine and a silky finish.
Method
- 1
Preheat the oven to 350°F (175°C) and line a 10x15-inch jelly roll pan with parchment.
- 2
Beat the eggs and sugar on high for about 5 minutes, until pale and thick, then fold in the vanilla.
- 3
Sift together the flour, baking powder, and salt, and gently fold in. Fold in the warm milk.
- 4
Spread the batter in the pan and bake 10 to 12 minutes, until the center springs back. Turn out onto a powdered-sugar-dusted sheet of parchment, peel the liner, and roll up from the short end while warm. Cool completely.
- 5
Make the pastry cream: heat the milk until steaming. Whisk the yolks, sugar, and cornstarch, then slowly whisk in the hot milk. Return to the pan and cook, whisking constantly, until thick and bubbling. Off the heat, stir in the vanilla and butter.
- 6
Press plastic wrap onto the surface of the pastry cream and chill until cold and set.
- 7
Gently unroll the cake, spread with the cold pastry cream, and re-roll (without the towel). Wrap and chill 1 to 2 hours to firm up.
- 8
Make the ganache: heat the cream until steaming, pour over the chopped chocolate, let sit 1 minute, then stir smooth. Cool slightly until pourable but thickened.
- 9
Set the chilled roll on a rack and pour the ganache over the top, letting it drape down the sides. Chill 20 to 30 minutes to set, then slice with a warm serrated knife.
Tips
- Whisk the pastry cream constantly as it thickens so it stays silky and lump-free.
- Chill the filled roll before glazing — a cold cake gives a thicker, glossier ganache coat.
- Roll the sponge warm to prevent cracking; any small crack disappears under the ganache.
Variations to try
- Add a shot of espresso to the ganache for a mocha edge.
- Flavor the pastry cream with a scraped vanilla bean or a splash of rum.
- Fold a little whipped cream into the cooled pastry cream for a lighter diplomat-style filling.
- Top the set ganache with chocolate curls or a few toasted almonds.
Storage & make-ahead
Keep the assembled roll in an airtight container in the refrigerator for up to 3 days — the pastry cream must stay cold. Slice it chilled with a warm knife for the cleanest swirls, and let slices sit a few minutes at room temperature before serving. The filled (unglazed) roll can be frozen up to 1 month; thaw in the fridge, then glaze with fresh ganache.
Frequently asked questions
- Why did my pastry cream turn out lumpy?
- The heat was too high or you stopped whisking. Cook it over medium heat and whisk constantly; if lumps form, pass it through a fine sieve while warm.
- Can I make it ahead?
- Yes. Make the pastry cream a day ahead, and assemble and glaze the roll up to a day before serving. Keep it refrigerated throughout.
- Why did my cake crack?
- It was likely rolled too cool. Roll the warm sponge right out of the oven — and remember the ganache hides any small cracks anyway.
- What chocolate is best for the ganache?
- A quality dark chocolate around 55-65% cocoa gives the classic glossy, balanced glaze. Avoid chocolate chips, which contain stabilizers that dull the shine.
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