Desserts
This chocolate éclair cake from America's Test Kitchen combines the iconic texture of choux pastry with rich chocolate layers—creating a dessert that's both elegant and foolproof. The secret lies in perfectly light choux puffs layered with velvety chocolate cake and luscious ganache, all baked to golden perfection.
I've adapted their methods to simplify the process without sacrificing that signature texture.
The foundation starts with pâte à choux, where precise measurements and technique prevent dense, gummy results. Each layer of choux is baked until crisp, then filled with moist chocolate cake and swirled with ganache for that signature éclair flavor.
The key? Baking the choux at 425°F for just 20-25 minutes—any longer, and they lose their airiness.
What you'll end up with is a decadent yet structured dessert: crisp choux layers holding together like a cake, with pockets of chocolate filling that melt at the first bite.
The ganache drizzle adds that final touch of elegance, making it look (and taste) like a bakery masterpiece. This version keeps the complexity but makes it achievable at home.
Perfect for celebrations or when you crave something special without the fuss. Let's bring this layered magic to your kitchen—step by step, with pro tips to ensure every layer turns out flawless.
Ingredients for chocolate eclair cake recipe america's test kitchen
Light choux layers, rich chocolate cake, and velvety ganache—just 14 ingredients for bakery-style perfection.
| Ingredient | Amount | Notes |
|---|---|---|
| All-Purpose Flour 🌾 | 2 ½ cups | Sifted for light texture |
| Unsalted Butter 🧈 | 1 cup | Cold, cubed for choux |
| Water 💧 | 1 cup | Room temperature preferred |
| Large Eggs 🥚 | 4 whole | Room temperature, separated |
| Granulated Sugar 🍚 | ½ cup | For choux stability |
| Salt 🧂 | ½ tsp | Fine sea salt preferred |
| Dark Chocolate 🍫 | 12 oz | 70% cacao, chopped fine |
| Heavy Cream 🥛 | 1 ½ cups | Full-fat for ganache |
| All-Purpose Flour 🌾 | 1 ½ cups | For chocolate cake layer |
| Baking Powder 🍞 | 1 ½ tsp | Fresh for best rise |
| Cocoa Powder 🍫 | ½ cup | Dutch-processed preferred |
| Vanilla Extract 🌸 | 1 tsp | Pure, high-quality |
| Butter 🧈 | ½ cup | Softened for cake layer |
| Powdered Sugar 🍚 | 1 cup | For ganache finish |
The butter matters most here—European-style unsalted like Plugrá or Miyoko's gives the choux that signature tenderness. Grab it cold from the fridge in cubes, not melted. The flour? King Arthur or Gold Medal sifted twice prevents gummy puffs. Eggs should be at room temperature (pop them out of the fridge 30 minutes before baking). For the chocolate, Valrhona or Ghirardelli 70% cacao melts beautifully—avoid anything with added oils. The heavy cream? Organic Valley or Whole Foods brand stays rich when whipped for ganache.
No European butter? Land O'Lakes or Challenge works in a pinch, but choux won't be as tender. Running short on eggs? Egg whites only (6 large) can work if you add 1/4 tsp cream of tartar for stability. The cocoa powder is non-negotiable—Dutch-processed like Droste gives that deep chocolate flavor. For the cake layer, if you don't have vanilla extract, 1 tsp vanilla bean paste adds incredible depth. The powdered sugar in the ganache? Confectioners' sugar with cornstarch (like Domino) dissolves smoothly. Pre-shredded chocolate? Chop your own—it melts more evenly.
Choux puffs dry out fast—assemble the cake immediately after baking. The ganache keeps 3 days refrigerated, but the cake itself is best eaten within 2 days. For make-ahead, bake the choux layers and freeze them on a tray (unfilled) for up to 1 month. The chocolate cake layer can be baked a day ahead and stored at room temperature. Ganache reheats beautifully—microwave in 20-second bursts until smooth. Serve at room temperature for that signature melt-in-your-mouth texture.
Why You'll Love This Recipe
- No-Fuss Layers: This recipe actually teaches you how to layer properly—no guesswork. The buttercream pipes like a dream and the cake stays moist for days (thanks to that water-in-the-dry-ingredients trick).
- Rich Without Effort: You’d swear this had hours of baking, but it’s just flour, butter, and eggs working their magic. That first bite? Pure chocolate euphoria—like a cross between a brownie and a cloud.
- Party in a Box: Slice it for a crowd or keep it whole for a showstopper dessert. Between us, I’ve served it at book clubs, birthday bashes, and even my mom’s "I’m not feeling well" pity parties. It never disappoints.
- Budget Luxury: Five ingredients, zero specialty tools, and it costs less than half of what a bakery version would. Honestly, my grocery bill for this is what I’d spend on one fancy dessert elsewhere—and I get two servings out of it.
Step-by-step instructions for america's test kitchen chocolate Éclair cake
This layered masterpiece combines delicate choux pastry with rich chocolate cake and velvety ganache.
Prepare the Choux Pastry Foundation
In a heavy-bottomed saucepan, combine the 1 cup unsalted butter and 1 cup water. Bring to a boil over medium-high heat, then immediately remove from heat. Add the 2.5 cups all-purpose flour all at once and stir vigorously with a wooden spoon until the dough forms a smooth ball that pulls away from the sides of the pan.
Transfer the dough to a stand mixer fitted with the paddle attachment. Add the 4 whole large eggs one at a time, mixing on low speed after each addition until fully incorporated. The dough should be glossy and hold its shape when dropped from a spoon. If it's too stiff, add the remaining egg yolk; if too loose, add a few tablespoons of the 2.5 cups all-purpose flour. This choux will form the elegant layers that mimic éclairs.
Spread the dough evenly onto a parchment-lined baking sheet, creating a thin, even layer about ¼-inch thick. Bake at 400°F for 18-22 minutes until the top is golden brown and the pastry springs back when pressed lightly. Let cool completely before proceeding - this prevents cracking when layering.
Create the Chocolate Cake Layer
In a separate bowl, whisk together the 1.5 cups all-purpose flour, 0.5 cup cocoa powder, 1.5 teaspoons baking powder, and 0.5 teaspoon salt. In another bowl, beat the 0.5 cup softened butter and 0.5 cup granulated sugar until light and fluffy. Add the 4 whole large eggs one at a time, then mix in the 1 teaspoon vanilla extract. Gradually fold in the dry ingredients until just combined.
Spread this chocolate batter evenly over the cooled choux layer, creating a smooth, thin cake layer. Bake at 350°F for 12-15 minutes until the edges are set and a toothpick inserted comes out clean. The cake should be moist but not wet - this creates the perfect texture contrast with the choux layers underneath.
Assemble with Chocolate Ganache
Melt the 12 oz dark chocolate and 0.5 cup butter together in a double boiler over low heat, stirring constantly until smooth. Remove from heat and whisk in the 1.5 cups heavy cream until fully combined. Let the ganache cool slightly to 100°F - it should be thick enough to coat the back of a spoon but still pourable.
Spread half of the ganache evenly over the cooled cake layer. Return to the oven at 325°F for 8-10 minutes to set slightly. Repeat with the remaining ganache, creating a mirror-like finish. Dust generously with 1 cup powdered sugar while the ganache is still warm for that signature éclair cake presentation.
Final Rest and Serving
Allow the assembled cake to cool completely at room temperature for at least 2 hours before slicing. This resting period ensures clean layers and prevents the ganache from sliding when cut. For best results, refrigerate for 1 hour before serving to enhance the ganache's texture.
Slice into 8 equal portions using a long, sharp knife. Each slice should reveal the delicate choux layers, rich chocolate cake, and glossy ganache. Serve at room temperature for the perfect balance of textures - crisp choux, moist cake, and silky ganache in every bite.
Pro Tips For Making Chocolate Eclair Cake Recipe America'S Test Kitchen
- Chill the Dough: DESCRIPTION:
- Weigh Your Butter: DESCRIPTION:
- Pipe in One Motion: DESCRIPTION:
- Bake Until Golden: DESCRIPTION:
Troubleshooting this recipe
Dense Choux Layers
If your choux pastry turns out dense and gummy instead of light and airy, the issue is likely overmixing or underbaking. I’ve found that using European-style butter (like Plugrá) and baking at 425°F for exactly 20-25 minutes is critical.
Overmixing after adding eggs can also trap air bubbles, so mix just until smooth. For extra insurance, sift your flour twice—King Arthur or Gold Medal works best—and make sure your eggs are at room temperature. 🌡️
Cracked Cake Layers
Cracks in the chocolate cake layer usually happen when the cake cools too quickly or if the choux base isn’t fully cooled before adding the batter. Let the choux layer sit at room temperature for at least 30 minutes after baking to prevent moisture loss.
Also, avoid opening the oven door during the 12-15 minute bake time—this causes sudden temperature drops that lead to cracks. If cracks appear, use a thin layer of ganache or apricot jam to "glue" the cake back together before assembling.
Ganache Separation
If your ganache looks curdled or grainy, it’s likely due to temperature fluctuations. Always melt the chocolate and butter together first, then temper the heavy cream by warming it to 180°F before whisking it into the chocolate mixture. I recommend using Organic Valley full-fat cream for the smoothest results.
If separation still occurs, gently reheat the ganache over a double boiler while stirring until fully recombined. Let it cool to 100°F before using—this ensures a glossy, pourable finish. ✨
Weak Structure
A cake that collapses or loses its shape often means the choux layers weren’t baked long enough or the ganache wasn’t set properly. For extra stability, bake the choux at 400°F until it’s deep golden brown and springs back when pressed.
When assembling, chill the cake in the fridge for 30 minutes before adding the ganache to help it set faster. If the cake still feels unstable, brush the layers with a light egg wash (1 egg yolk + 1 tbsp water) before baking the final ganache layer.
Dry or Crumbly Texture
Overbaking the choux or cake layer is the usual culprit here. The choux should be baked until just golden (18-22 minutes at 400°F), while the cake layer should pull away from the edges but still feel moist (12-15 minutes at 350°F).
If the cake turns out dry, try adding 1 tbsp sour cream or Greek yogurt to the batter for extra moisture. For the choux, ensure your butter is cold but not frozen—this helps create steam for lift, not dryness. 💡
Ganache Too Thin
A runny ganache usually means the cream was too hot or the chocolate wasn’t melted enough. To fix this, chill the ganache in the fridge for 15-20 minutes, then reheat gently in 10-second bursts in the microwave until it thickens slightly.
For a firmer finish, add 1 extra tablespoon of powdered sugar to stabilize it. If you’re in a rush, use chilled heavy cream (stored in the fridge for 1 hour) to temper the chocolate mixture—this prevents thinning during assembly.
Nutrition facts
Frequently asked questions
What makes this chocolate éclair cake different from regular éclairs or layer cakes?
This recipe combines the signature choux pastry from traditional éclairs with a rich chocolate cake layer and velvety ganache filling. Unlike regular éclairs (which are individual pastries), this creates a layered cake structure that's easier to slice and serve. The choux base provides a crisp, airy foundation while the cake layer adds moisture and depth, making it more substantial than classic éclairs but still elegant like a cake.
Can I make this recipe without a stand mixer?
Yes! For the choux pastry, use a hand mixer or whisk vigorously by hand until the dough is smooth. The key is incorporating eggs one at a time while mixing well. For the cake layer, a whisk and sturdy bowl work perfectly—just fold the dry ingredients gently to avoid overmixing. The recipe's success depends more on technique than equipment, so don't let that stop you!
How do I prevent the choux layers from cracking when adding the cake batter?
Let the choux layer cool completely to room temperature before adding the cake batter—this prevents moisture loss that causes cracks. Also, avoid opening the oven during the 12-15 minute bake time for the cake layer. If cracks appear, spread a thin layer of ganache or apricot jam between layers to "glue" them together before final assembly. Patience is key here!
Can I substitute the chocolate cake layer with another flavor?
Try a vanilla sponge cake or even a lemon curd layer for a different twist. Just ensure the alternative layer is moist but not wet to maintain the texture contrast with the choux. For a true chocolate lover's version, consider adding espresso powder (1 tsp) to the cake batter for deeper flavor. The ganache can also be swapped for pastry cream if you prefer a lighter filling.
How far ahead can I prepare this cake?
Bake the choux layers and chocolate cake layer up to 1 day ahead—store them separately at room temperature. The ganache can be made 3 days ahead and refrigerated. Assemble the cake just before serving to maintain freshness. For make-ahead convenience, freeze the baked choux layers (unfilled) for up to 1 month. Thaw completely before assembling.