Preheat the oven to 350 degrees.
Beat the egg inside a small mixing bowl and use a silicone brush to brush the egg wash over the pie crust until it’s fully covered. Bake for 10 minutes. When done, remove from heat and allow it to cool completely before moving on.
In a large mixing bowl, combine powdered sugar and cream cheese using an electric hand mixer. Mix until smooth and until there are no lumps from the cream cheese.
Add in whipped topping, vanilla, peanut butter, chocolate sauce, caramel sauce, and instant pudding packet. Mix again until all ingredients are fully incorporated. It will be thick.
Fold in three Snickers bars, chopped into bits, and mix with a rubber spatula.
Add the mixture to the bottom of the pie crust. Use a rubber spatula to spread the mixture into the crust, filling the entire bottom and spreading evenly on top.
Cover and place inside the refrigerator for 2.5-3 hours to chill.
When ready to serve, top with whipped topping and additional chopped Snickers bar pieces.