In a 9 x 13 glass casserole dish, arrange one layer of graham crackers, breaking up the crackers as needed to fill the space.
In a large mixing bowl, whisk together the pudding mix and the milk until smooth. Fold in the whipped cream.
Spread half of the pudding mixture over top of the graham crackers. Layer more graham crackers and then a final layer of pudding mixture and more graham crackers. Let chill for at least 30 minutes in the fridge.
While it's chilling, pour the chocolate chips into a medium mixing bowl and set aside.
Heat a small saucepan with heavy cream over medium heat until hot. Pour over top of the chocolate chips and stir until the chocolate is melted and smooth.
Let the chocolate sit and cool or refrigerate until thickened before pouring and smoothing over top of the eclair cake.
Cover and refrigerate for at least 4 hours or overnight before cutting and serving.
Notes
Swap the pudding flavor: Chocolate, cheesecake, or banana pudding mix are all delicious twists.
Add a layer of sliced bananas: Layer them between the pudding and graham crackers for a banana cream eclair cake vibe.
Make it mocha: Use coffee-flavored pudding and add a dash of espresso powder to the chocolate topping for a sophisticated coffee-chocolate dessert.
Try cinnamon graham crackers: They bring a warm, cozy spice to the mix!
Use homemade whipped cream: If you’re feeling fancy, freshly whipped cream (lightly sweetened) takes the pudding layer up a notch.