Preheat oven to 325ºF. Grease a 13x9x2” baking pan.
In a medium bowl with an electric mixer on medium, combine eggs, pumpkin, sugar, salt, pumpkin pie spice, and cinnamon until well blended. Pour into prepared pan. Sprinkle with dry cake mix. Drizzle melted butter over mix; Sprinkle with nuts. Cover loosely with foil and bake for 40 minutes. Remove foil and continue baking for another 40 minutes or until golden brown.
Serve by cutting into squares, top if desired with whipped topping.