01 -
Whisk pudding mix and cold milk until thickened. Fold in whipped topping until combined.
02 -
In a 9x13-inch dish, layer graham crackers, half the pudding mixture, more crackers, remaining pudding, and final layer of crackers.
03 -
Whisk cocoa powder and powdered sugar. Add melted butter, milk, and vanilla. Mix until smooth and spreadable.
04 -
Spread chocolate frosting over top layer. Cover and refrigerate at least 4 hours or overnight.