Place topping ingredients in a heavy saucepan and heat over low heat until cream is just hot to touch, do not boil it
Remove from heat and let sit for about 5 minutes
then stir or whisk to combine chocolate chips, set aside while working on the rest of the cake.
In a large bowl add milk and pudding mix, and blend until thick
In a separate bowl, whip cream, vanilla, and powdered sugar until stiff peaks form
Fold whipped cream into pudding mixture
Add a single layer of graham crackers to the bottom of an 8x11 inch pan or container
Spread 1/3 of the pudding over the graham cracker layer
Add a second layer of graham crackers
Spread second third of pudding over graham crackers
Repeat with a third layer of graham crackers and pudding
Top with a final layer of graham crackers
Spread the now mostly cooled chocolate ganache over the top of the graham crackers
Cover carefully and then refrigerate a minimum of an hour