Step 1

Preheat the oven to 350 degrees Fahrenheit. Grease a 9 x 13-inch baking dish with butter or cooking spray.

Step 2

Combine the pumpkin purée, evaporated milk, sugar, eggs, cinnamon, and pumpkin pie spice in a bowl. Mix well before pouring the mixture into the baking dish.

Step 3

Sprinkle the dry cake mix over the top of the pumpkin filling. Then, drizzle the melted butter over the entire dish. Finally, top the dessert with walnuts.

Step 4

Bake for approximately 1 hour or until the dessert passes the toothpick test (see notes).

Step 5

Remove the dessert from the oven and let it cool fully. Then, cut it into 24 squares. Serve (topped with whipped cream or ice cream if desired), and enjoy!