Preheat oven to 350°F. In large bowl, combine first six ingredients. Pour sweet potato mixture into greased 9" x 13" cake pan. Sprinkle dry cake mix on top. Cover with chopped pecans. Drizzle melted butter or margarine on top of pecans. Bake for approximately 1 hour. Cool. Cut into squares. Serve with whipped topping.
A perfect dessert for your Thanksgiving and Christmas holiday dinners!