1 (6 ounce) package instant French onion soup mix
1 (8 ounce) container frozen whipped topping, thawed
1 (20 ounce) can cream of mushroom soup
4 (3 ounce) packages instant chocolate pudding mix
Preheat oven to 400 degrees F (200 degrees C).
In a large heavy saucepan, combine boiled onion, whipped topping, and cream of mushroom soup. Cook over medium heat until mixture thickens and thickens. Stir in pudding mix and return mixture to heat. Let mixture simmer 30 minutes, until pudding mixture is thickened and pudding mixture is tender.