Add 1 1/2 cups of heavy cream along with the maple syrup and vanilla to the bowl of a stand mixer fitted with the whisk attachment. Beat on medium speed until stiff peaks form - about two minutes.
Remove the mixture to a bowl and place it in the fridge while you make the pudding base.
Add the pumpkin puree and cream cheese to the stand mixer and beat them together until combined.
With the mixer on low, slowly add the milk and remaining 1/2 cup heavy cream. Mix until combined.
Finally, add the pudding mix and whisk on medium speed until the mixture is well combined and thickened slightly, about two minutes.
Add the whipped cream and fold it gently into the pudding mixture.
Spoon or pipe the mousse into serving containers and garnish with crumbled gingersnaps or graham crackers. Chill at least two hours and enjoy.