Quick and Easy Chocolate Mousse

This is one of our favorite desserts.  It's quick, easy and absolutely delicious.  And the secret ingredient is sour cream!  Yes, although surprising, it gives this mousse a nice, refreshing boost.  Great dessert!  Enjoy!
-2 cups milk (at least 2%)
-1 (5.9 oz) package instant chocolate pudding and pie mix
-1/2 cup sour cream
-8 oz frozen whipped topping, thawed
-whipped cream, for garnishing
In a large bowl, mix the milk and pudding mix with the whisk for 2 minutes. Let it stand for about 3 minutes or until soft set.
Add the sour cream and whipped topping.  Mix gently until very well incorporated. Pour into individual dishes.  Top with some extra whipped cream.  Enjoy!