Preheat oven to 350° F. Grease a 9" x 13" pan and set aside.
In a small saucepan melt the butter on medium low heat. Add the chopped pecans and cook 3-5 minutes until fragrant & lightly toasted.
1/2 cup Salted Butter, 1 cup Chopped Pecans
In a large bowl combine the cake mix, pumpkin puree, eggs, butter pecan mixture, pumpkin pie spice, cinnamon and salt.
1 Box Spiced Cake Mix, 1 15 oz. Can of Pumpkin Puree, 2 Large Eggs, 1 tsp Pumpkin Pie Spice, 1 tsp Cinnamon, 1/2 tsp Salt
Mix with a hand mixer just until combined, about 1 minute. Don't overmix.
Spread the batter into prepared pan. Bake for 25-30 minutes or until a toothpick inserted in the center comes out clean.
Let cool while you prepare the filling and whipped cream.
Once cooled, use the end of a wooden spoon or straw to poke holes all over the cake, being careful not to poke all the way to the bottom.
Spread the butterscotch filling all over the cake making sure all the holes are filled (some filling will remain on top of cake). Chill in the fridge for 15 minutes.
Evenly spread the remaining cinnamon whipped cream on top of cake. Dust with more cinnamon.
Serve immediately or store in fridge loosely covered until ready to serve.