Pumpkin Dump Cake

It doesn't get much easier than this recipe! It doesn't look pretty, but very YUMMY!
1 (16 oz.) can solid pack pumpkin
1 (12 oz) can evaporated milk
3 eggs
1 1/2 cups sugar
4 tsp pumpkin pie spice (or a blend of cinnamon, ginger, cloves)
1/2 tsp salt
1 yellow cake mix
2 sticks melted butter (here's why it takes so good!)
1 cup chopped pecans (optional)
whipped topping

Combine first six ingredients in large bowl.
Pour into a 9" x 13" pan. Sprinkle dry cake mix evenly over pumpkin mixture. Drizzle evenly with melted butter. Bake at 350 degrees for 50-55 minutes. Sprinkle pecans over cake for the last 10 or 15 minutes of baking time. Cool completely. Serve with whipped topping.
Refrigerate leftovers.