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Side view of a No-Bake Chocolate Eclair Cake slice showing the crisp golden crust and thick creamy custard under a smooth dark chocolate ganache.

No-Bake Chocolate Eclair Cake with a Silky Custard Filling and Glossy Ganache

A professional-grade No-Bake Chocolate Eclair Cake featuring a crisp graham cracker crust, a rich scratch-made vanilla custard, and a mirror-finish dark chocolate ganache. Perfect for elegant entertaining and minimalist food photography enthusiasts.
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Prep Time 30 minutes
Cook Time 15 minutes
Total Time 45 minutes
Servings: 12 slices
Course: Desserts, No-Bake
Cuisine: American, French-inspired
Calories: 385
Ingredients Equipment Method Notes

Ingredients
  

Graham Cracker Crust
  • 1.5 cups (180g) Graham cracker crumbs Finely ground
  • 6 tbsp (85g) Unsalted butter Melted
  • 2 tbsp (25g) Granulated sugar
Vanilla Custard Filling
  • 2.5 cups (600ml) Whole milk
  • 3/4 cup (150g) Granulated sugar Divided
  • 4 large Egg yolks
  • 1/4 cup (32g) Cornstarch
  • 2 tsp (10ml) Vanilla bean paste Or vanilla extract
  • 1/2 cup (120ml) Heavy cream Chilled, for whipping
Dark Chocolate Ganache
  • 8 oz (225g) Dark chocolate (60% cacao) Finely chopped
  • 1 cup (240ml) Heavy cream

Equipment

  • 1 9-inch square pan Lined with parchment paper
  • 1 Heavy-bottomed saucepan For custard
  • 1 Offset Spatula For smoothing layers
  • 1 Fine-mesh Sieve For straining custard

Instructions
 

Prepare the Crust
  1. Mix graham cracker crumbs, melted butter, and sugar. Press firmly into a lined 9-inch pan using a flat cup.
Make the Custard
  1. Heat milk and half the sugar. Whisk yolks, remaining sugar, and cornstarch. Temper hot milk into yolks, return to heat, and whisk until thick and bubbling. Stir in vanilla.
  2. Strain through a sieve and chill with plastic wrap on the surface until cold.
  3. Whip heavy cream to stiff peaks and fold into the chilled custard. Spread over the crust and chill for 1 hour.
Top with Ganache
  1. Pour hot cream over chopped chocolate. Let sit 5 minutes, then stir until smooth and reflective.
  2. Pour over custard layer, tilting the pan to cover. Chill for at least 4 hours before slicing with a hot knife.

Notes

Use a hot, clean knife for the most pristine slices.
Ensure the custard is completely cold before adding the ganache to prevent layer bleeding.
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