01 -
Whisk the instant pudding mix and cold milk in a large bowl for about 2 minutes, until thick. Fold in the thawed whipped topping until smooth and evenly combined.
02 -
Arrange a single layer of graham crackers in the bottom of a 9x13-inch baking dish. Break crackers as needed to cover the bottom.
03 -
Spread half of the pudding filling over the crackers. Add a second layer of graham crackers, spread on the remaining filling, then finish with a third layer of graham crackers.
04 -
Combine the chocolate chips, heavy cream, butter, and salt in a microwave-safe bowl. Microwave in 20-second bursts, stirring well each time, until smooth and glossy.
05 -
Let the ganache cool for 5 minutes, then pour it over the top graham cracker layer. Spread it evenly to the edges with an offset spatula.
06 -
Cover the dish without touching the chocolate topping. Refrigerate for at least 8 hours, preferably overnight, then slice cold.