In mixing bowl, mix cake mix, pumpkin, butter and eggs well then pour into Bundt pan.
Bake 45-50 minutes until toothpick inserted in middle comes out cleanly. Let cool in pan 5 minutes then remove from pan and let cool completely on rack.
Once cooled, mix caramel sauce and powdered sugar; drizzle over Bundt cake. Sprinkle with chopped nuts.