Chocolate Eclair Cake Recipe

This chocolate eclair cake is a sliceable layered dessert: a thin vanilla sponge, a thick vanilla pastry cream lightened with whipped cream, and a glossy chocolate glaze on top. Plan on about 45 minutes of hands-on work, 12 to 14 minutes in the oven, and at least 4 hours in the fridge. It cuts into 10 to 12 slices.

Most eclair cake recipes are the no bake kind, with graham crackers layered with pudding and whipped topping. I swapped the crackers for a quick egg sponge because that texture always felt off to me. Dry at the bottom on day one, soggy by day two. The sponge softens under the cream and eats like the inside of a real éclair shell.

The filling and glaze come from my chocolate eclairs recipe, scaled up for a cake. Piped those already? Then you know both steps.

What Goes Into Each Layer

• Sponge: 3 large room temperature eggs, ½ cup granulated sugar, ½ cup sifted all-purpose flour, 1 teaspoon vanilla extract, a pinch of salt. No butter and no baking powder.
• Pastry cream: 2 cups whole milk, 4 egg yolks, ½ cup sugar, ¼ cup cornstarch, 1 tablespoon unsalted butter, 1 teaspoon vanilla bean paste or extract.
• Lightener: ½ cup heavy cream, whipped to soft peaks and folded into the cold pastry cream.
• Glaze: 1 cup finely chopped semi-sweet chocolate, ½ cup heavy cream, 1 tablespoon butter. That is 2 parts chocolate to 1 part cream.
• Pan: a rimmed baking sheet or 9×13 inch pan lined with parchment.
• Oven: 350°F (175°C) for 12 to 14 minutes.
• Keeps: 3 days covered in the fridge. It does not freeze well.

Sponge Base or Graham Crackers: Which Eclair Cake to Make?

The old fashioned chocolate eclair cake is an icebox dessert. Whole graham crackers are layered with vanilla pudding folded into whipped topping, spread with chocolate frosting, and left overnight until the crackers soften into something like cake. Nothing goes in the oven. Kids can build it. The trade off is a softer, sweeter cake whose slices slump by the second day.

This version adds one short bake for the sponge and swaps the pudding for a cooked pastry cream and the frosting for a real chocolate glaze. Slices stand up with straight sides, the filling tastes of milk and vanilla rather than mix, and it is less sweet.

You can also meet in the middle. Lay a single layer of whole graham crackers in the pan instead of the sponge, then add this cream and glaze. Chill it overnight rather than 4 hours, because the crackers need the extra time to soften all the way through.

Whipping the Sponge to the Ribbon Stage

The sponge has no baking powder, so the air you beat into the eggs is the only lift it gets. Beat the room temperature eggs and sugar for 4 to 5 minutes until pale, thick, and about tripled. Lift the beaters: the batter should fall in a ribbon that sits on the surface for a few seconds before sinking in. Mix in the vanilla and salt briefly.

Sift the flour over the batter in two additions and fold with a spatula, scooping from the bottom of the bowl, just until no dry streaks remain. Spread it into a thin, even layer on the lined pan. Grease the pan under the parchment so the paper does not slide, and leave a little overhang for lifting.

Bake 12 to 14 minutes, until lightly golden and the top springs back when touched. Cool it completely in the pan. A flat, rubbery sponge almost always means cold or underbeaten eggs, or flour folded in too hard. A top that sticks and tears was pulled a minute or two early. My vanilla sponge cake uses the same method for a taller layer.

Cooking a Pastry Cream Thick Enough to Slice

Heat the milk until steaming. In a bowl, whisk the sugar, egg yolks, and cornstarch until smooth and pale, then pour in about ½ cup of the hot milk while whisking. Tip everything back into the saucepan and whisk constantly over medium heat.

Within 3 to 5 minutes it goes from thin to thick and glossy. Keep whisking until you see a few slow bubbles break in the center. Egg yolks carry an enzyme that thins cornstarch unless the cream gets that hot, which is why a pastry cream that looked thick can turn runny overnight.

Off the heat, whisk in the butter and vanilla. Lumps? Sieve it now. Press plastic wrap onto the surface and chill until fully cold. A ¼ cup of cornstarch for 2 cups of milk is firmer than a pudding on purpose; it is what gives each slice a clean edge. My vanilla pastry cream recipe has more on the method.

Folding Whipped Cream Into the Vanilla Filling

Whip the ½ cup of heavy cream to soft peaks, where the tips fold over when you lift the whisk. Cold pastry cream sets quite firm, so whisk it smooth first. Then fold in the whipped cream in two or three batches until the color is even.

The pastry cream must be cold. Warm, it melts the whipped cream and the filling runs out of every slice. Pastry chefs call this mix diplomat cream, and it is lighter than pastry cream alone. Stabilized whipped topping can stand in for the cream, though the texture is less smooth.

Assembling and Glazing the Cake

Set the cooled sponge on a serving platter or inside a cake frame. Spread the cream with a small offset spatula without pressing hard into the sponge, and keep the top level so the glaze sits evenly. Clean edges now mean sharp slices later.

For the glaze, heat the cream until it just simmers, pour it over the chopped chocolate and butter, and wait 2 minutes. Stir slowly from the center outward until smooth and shiny. It should run off a spoon like thick syrup.

Pour it while warm, not steaming, into the middle of the cake and nudge it out toward the edges. Then leave it alone. It levels itself. Dragging a spatula through it pulls up the cream underneath. My chocolate ganache recipe covers other ratios if you want a thicker topping.

How Long to Chill Before Slicing

Give it at least 4 hours in the fridge. Overnight is better: the sponge drinks a little moisture from the cream, and the layers set into one. It is ready when the glaze has a soft sheen and no longer looks wet, and the cream feels firm at the cut edge. Over-chilling does no harm. Under-chilling does.

Cut with a long, sharp knife dipped in hot water and wiped dry between cuts. Press straight down instead of sawing, so the glaze does not crack and slide. Serve it cold, straight from the fridge.

When the Eclair Cake Misbehaves

• The cream runs when sliced: the pastry cream never reached a bubble, the whipped cream went into warm pastry cream, or the cake chilled less than 4 hours.
• Lumpy filling: the cold pastry cream was not whisked smooth before folding. Sieve it next time.
• Dull or grainy glaze: the cream boiled hard, or water got into the chocolate. Heat the cream only to a simmer and stir gently.
• Sponge sticks to the paper: it was underbaked. Bake until the top springs back and pulls slightly from the pan edges.

Mocha, Chocolate Sponge and Other Twists

Want a chocolate sponge? Swap 2 tablespoons of the flour for cocoa powder. A mocha glaze takes 2 tablespoons of espresso stirred in; it will be a little looser, so let it cool a few minutes longer before pouring. Chopped strawberries can go into the cream, but blot them dry first so they do not water it down.

For New Year, finish it like my eclairs with gold glaze. The same cream and chocolate pairing comes in round form as a Boston cream pie, and for a showier plated dessert there are my pistachio chocolate éclair towers.

Storing Eclair Cake and Making It Ahead

Keep the cake covered in the fridge for up to 3 days. The glaze stays glossy and the filling stays smooth. I do not freeze it: frozen pastry cream weeps water as it thaws and turns grainy, and the sponge goes soggy.

Planning a party? Bake the sponge and cook the pastry cream the day before, wrap both, and chill. On the day, whip the cream, assemble, glaze, and give it at least 4 hours. Assembling the night before serving is even better.

Quick Answers About This Eclair Dessert

Is this chocolate eclair cake no bake?

Not quite. Only the thin sponge bakes, for 12 to 14 minutes at 350°F. For a true no bake version, use a layer of graham crackers instead and chill it overnight.

Can I use instant vanilla pudding instead of pastry cream?

You can, but the filling will be softer and sweeter and the slices will not hold a clean edge. The cooked pastry cream is what makes this version sliceable.