Last Updated on January 3, 2026 by Kimberly Stroh

If you love classic desserts with a no-bake twist, this Overnight Chocolate Eclair Cake is about to become a favorite. Inspired by the flavors of a traditional chocolate éclair, this easy icebox cake layers creamy vanilla pudding, fluffy whipped topping, and graham crackers, all finished with a rich homemade chocolate ganache. The magic happens in the fridge as it chills overnight, allowing the layers to soften and meld into a sliceable dessert. Perfect for potlucks or anytime you want an impressive dessert without turning on the oven, this recipe is simple, nostalgic, and irresistibly decadent.

Why I Love This Cake For Potlucks

This Overnight Chocolate Eclair Cake is perfect for potlucks because it serves a crowd with ease—up to 24 generous portions from one simple 9×13 pan. Since it’s made ahead and chilled overnight, there’s no last-minute prep or stress on the day of the event. It travels well, slices cleanly, and delivers familiar, crowd-pleasing flavors that both kids and adults love, making it a guaranteed hit on any dessert table.

Overnight Chocolate Eclair Cake Ingredients:

• Instant Vanilla Pudding Mix: Using the small 3.4 oz box
• Milk: I prefer whole milk
• Whipped Topping: Cool Whip is the brand I prefer to use
• Graham Crackers: Use plain or honey graham crackers
• Heavy Whipping Cream
• Semisweet Chocolate Chips: Any brand is fine
• Optional for serving: fresh mint leaves

Tips For Making Your Chocolate Ganache

• Use good-quality chocolate chips or chopped chocolate for the smoothest, richest ganache. Better chocolate melts more evenly and improves flavor.
• Heat the cream just until it begins to boil, not a full rolling boil. Overheating can cause the chocolate to seize or turn grainy.
• Stir slowly from the center outward using a spatula or spoon to create a smooth, glossy ganache without incorporating air.

How To Store Leftovers

Cover and refrigerate any leftover cake. Keep it in the refrigerator for up to 3 days. Or you can freeze the cake for up to 3 months. Let it thaw on the countertop for several hours before serving again. This will ensure it’s easy to slice after being in the freezer.

How to Make Your Overnight Chocolate Eclair Cake (Step-by-Step)

In a mixing bowl, add pudding. Whisk in milk for 2 minutes or until smooth. Add whipped topping and mix well. 

Place a single layer of graham crackers into the bottom of a 9×13 inch baking pan. Spread half of the whipped topping mixture on top.

Gently place a second single layer of Graham crackers on top, followed by the remaining whipped topping mixture. Refrigerate while you make the ganache. 

To make ganache, add heavy whipping cream to a small saucepan and heating over medium heat, stirring constantly, heat just until the mixture boils. Remove from heat and add chocolate chips.

Stir just so all the chocolate is covered in heavy cream. Let stand for 5 minutes. Stir well until ganache comes together. Let stand another 10 minutes to cool down. Add ganache on top of the whipped topping and spread evenly. Cover and refrigerate overnight. 

When ready to serve, score ganache and cut cake. Serve with fresh mint leaves if desired. Cover and refrigerate any leftover cake.