01 -
In a large mixing bowl, whisk instant vanilla pudding powder with cold milk until smooth and thickened with no lumps. Use a hand mixer if desired.
02 -
Gently fold the whipped topping into the prepared pudding until fully combined for a light, creamy consistency.
03 -
Arrange a single layer of graham crackers in the bottom of a 33 x 23 cm glass pan, trimming as necessary to fit.
04 -
Spread half of the pudding mixture over the graham crackers. Add a second layer of graham crackers, then top with the remaining pudding mixture. Finish with a final layer of graham crackers.
05 -
In a medium microwave-safe bowl, combine butter and milk. Microwave until just melted, about 1 minute, then stir until smooth and fully combined.
06 -
Add cocoa powder, powdered sugar, and vanilla extract to the butter mixture. Beat with a hand mixer or whisk until completely smooth and glossy, about 5 minutes.
07 -
Pour the prepared chocolate ganache evenly over the final layer of graham crackers, using an offset spatula to smooth the surface.
08 -
Cover the pan with plastic wrap and refrigerate overnight, or at minimum for 8 hours, to allow the layers to set and the crackers to soften.
09 -
Slice and serve chilled. Store any leftovers in the refrigerator.