Begin by making the cookie crust. Combine the Oreo crumbs with the melted butter and then firmly press the mixture into a 9x9 dish to make the crust.
Put the crust in the freezer for about 25-30 minutes to set.
In a mixing bowl, combine the butter, cream cheese and powdered sugar. Blend everything until the mixture is smooth. Once it is, fold in 9 ounces of the whipped topping. Mix it in until it's well combined.
In another bowl, mix the cold milk and chocolate pudding mix. Whisk them together until it thickens.
Take the crust layer out of the freezer. Spread the cream cheese mixture over the crust. Make sure that the layer you make is even. Sprinkle ¾ cup of the chopped pecans on top of the cream cheese layer.
Spread the chocolate pudding on top of the cream cheese and pecans. You'll want to do this as carefully as possible. Once you're done, add the rest of the whipped topping and smooth it out.
Time to let your inner artist shine! Drizzle the caramel sauce and chocolate syrup on top. Then, sprinkle the rest of the chopped pecans to give the dessert a satisfying crunch.
Put the finished dessert in the fridge and keep it there for at least 4 hours - overnight would be even better so that the flavors can combine.
Remove it from the refrigerator, slice into squares and serve chilled!